Setting up bring-your-own PSTN for Webex Contact Center

See also

Sources

1. 1
   The Cisco Calling Plans article states Cisco Calling Plans are not supported with Webex Contact Center or for high-concurrent, high-volume, or unusually short or long calls.disputed

   Get Started with the Cisco Calling Plans · Cisco Calling Plans requirements and limitations · Checked 2026-09-30
2. 2
   Cisco Calling Plans support Webex Contact Center only through the use of Service Numbers.

   Get Started with the Cisco Calling Plans · Cisco Calling Plans requirements and limitations · Checked 2026-09-30
3. 3
   The Webex Contact Center voice channel article lists Cisco Webex Calling Plan as a PSTN option for Webex Contact Center trials and in regions where Cisco supports service numbers.disputed

   Set up voice channels for Webex Contact Center · PSTN connectivity options > Cisco Webex Calling Plan · Checked 2026-09-30
4. 4
   A single upstream PSTN carrier forwarding to Local Gateway, CCP or Webex Contact Center PSTN numbers is supported, but chaining a second carrier's forwarding before the call reaches the contact center is not supported because of added delay.

   Set up voice channels for Webex Contact Center · PSTN call forwarding best practices · Checked 2026-09-30
5. 5
   Cloud Connected PSTN for Webex Contact Center is offered through certified calling providers in over 65 countries, with the partner handling activation, billing and number allocation.

   Set up voice channels for Webex Contact Center · PSTN connectivity options > Cloud Connected PSTN · Checked 2026-09-30
6. 6
   A certificate-based trunk requires a claimed domain and a DNS A or SRV record for the Local Gateway in public DNS, and authenticates by certificate with Local Gateway FQDN verification rather than digest.

   Get started with Local Gateway · Certificate-based vs registration-based trunk comparison · Checked 2026-09-30
7. 7
   Cisco's voice channel checklist includes verifying that the Voice Media Platform is Real Time Media Service and the Telephony type is Webex Calling.

   Set up voice channels for Webex Contact Center · Summary checklist · Checked 2026-09-30
8. 8
   Cisco's setup checklist calls for dedicated PSTN locations without endpoint devices and separate agent locations when agents use Webex Calling devices.

   Set up voice channels for Webex Contact Center · Summary checklist · Checked 2026-09-30
9. 9
   Webex Contact Center PSTN does not support international dialing; its numbers are limited to North American Numbering Plan destinations in the lower 48 states or Canada.

   Set up voice channels for Webex Contact Center · PSTN connectivity options > Webex Contact Center PSTN · Checked 2026-09-30
10. 10
    Webex Contact Center PSTN, bought from Cisco as a bundle with Webex Contact Center, is available only in the contiguous United States and Canada.

    Set up voice channels for Webex Contact Center · PSTN connectivity options > Webex Contact Center PSTN · Checked 2026-09-30
11. 11
    Webex Contact Center PSTN media supports the G.711 mu-law and G.711 A-law codecs.

    Set up voice channels for Webex Contact Center · Technical requirements > PSTN media and signaling standards · Checked 2026-09-30
12. 12
    A PSTN location is created in Control Hub under Locations > Manage location > Create manually, and multiple PSTN locations can be used for different interconnect options or multi-regional deployments.

    Set up voice channels for Webex Contact Center · Location configuration > creating PSTN location; multiple locations · Checked 2026-09-30
13. 13
    Webex Contact Center PSTN signaling uses RFC 2833 for DTMF.

    Set up voice channels for Webex Contact Center · Technical requirements > PSTN media and signaling standards · Checked 2026-09-30
14. 14
    An inbound entry point is created in Control Hub under Services > Contact Center > Customer Experience > Channels > Create Channel with channel type Inbound Telephony, a routing flow, time zone and service level threshold.

    Set up voice channels for Webex Contact Center · Number assignment to contact center > configuring entry points · Checked 2026-09-30
15. 15
    The channel setup article states that Webex Contact Center supports mapping only globalized +E.164 PSTN numbers to entry points and that extension numbers are not supported.disputed

    Set up a channel · Create an inbound telephony channel > Support Number · Checked 2026-09-30
16. 16
    When an entry point has both an E.164 number and an extension, Webex Contact Center always reports the call against the E.164 number, even if the extension was dialed.disputed

    Set up voice channels for Webex Contact Center · Number assignment to contact center > phone number mapping note · Checked 2026-09-30
17. 17
    Mapping a number to an entry point requires selecting the Webex Calling location, the PSTN number added in Webex Calling as the inbound arrival number, and a PSTN region; more numbers are added with Add.

    Set up voice channels for Webex Contact Center · Number assignment to contact center > phone number mapping · Checked 2026-09-30
18. 18
    Cisco documents four PSTN connectivity options for Webex Contact Center: Webex Contact Center PSTN, Cloud Connected PSTN, Webex Calling Local Gateway, and Cisco Webex Calling Plan.

    Set up voice channels for Webex Contact Center · PSTN connectivity options section · Checked 2026-09-30
19. 19
    Webex for Government does not support registration-based Local Gateway; it requires certificate-based trunks on IOS XE 17.12.1a or later with FIPS-compliant GCM ciphers.

    Configure Local Gateway on Cisco IOS XE for Webex Calling · Webex for Government section · Checked 2026-09-30
20. 20
    A certificate-based Local Gateway on Cisco CUBE requires Cisco IOS XE 17.9.1a or later, with 17.12.2 or later recommended.

    Configure Local Gateway on Cisco IOS XE for Webex Calling · Prerequisites / trunk types · Checked 2026-09-30
21. 21
    Cisco's Local Gateway example codec class prefers G.711 mu-law then G.711 A-law, which Cisco says suits most deployments.

    Configure Local Gateway on Cisco IOS XE for Webex Calling · voice class codec 100 · Checked 2026-09-30
22. 22
    Cisco's Local Gateway example routes between Webex Calling and a SIP PSTN trunk with dial-peer groups: the Webex dial-peer's destination is the PSTN dpg and the PSTN dial-peer's destination is the Webex dpg.

    Configure Local Gateway on Cisco IOS XE for Webex Calling · Configure Local Gateway with a SIP PSTN trunk; voice class dpg · Checked 2026-09-30
23. 23
    Numbers for calls routed into Webex Contact Center from a Local Gateway are provisioned in Control Hub in +E.164 format.

    Set up voice channels for Webex Contact Center · PSTN connectivity options > Webex Calling Local Gateway · Checked 2026-09-30
24. 24
    Cisco's Local Gateway configuration enables STUN usage with ICE-lite so media optimization is negotiated where possible; Webex for Government does not support it.

    Configure Local Gateway on Cisco IOS XE for Webex Calling · voice class stun-usage 100 · Checked 2026-09-30
25. 25
    Webex Calling Local Gateway lets a Webex Contact Center customer keep its current on-premises PSTN carrier; the customer's SBC registers with Webex Calling and routes calls between on-premises resources and Webex Calling.

    Set up voice channels for Webex Contact Center · PSTN connectivity options > Webex Calling Local Gateway · Checked 2026-09-30
26. 26
    Webex Calling Local Gateway as a Webex Contact Center PSTN option is available in over 140 markets.

    Set up voice channels for Webex Contact Center · PSTN connectivity options > Webex Calling Local Gateway · Checked 2026-09-30
27. 27
    On a registration-based trunk the Webex-facing dial-peer's max-conn should be at most 250.

    Configure Local Gateway on Cisco IOS XE for Webex Calling · dial-peer voice 100 voip · Checked 2026-09-30
28. 28
    An ISR4000 Local Gateway needs both Unified Communications and Security technology licenses; a Catalyst 8000 Edge needs DNA Advantage with voice cards or DSPs and at least DNA Essentials without them.

    Configure Local Gateway on Cisco IOS XE for Webex Calling · Platform requirements · Checked 2026-09-30
29. 29
    In Cisco's example the srtp command is set only on the Webex-facing dial-peer, so the PSTN-facing leg appears to use unencrypted RTP unless the carrier requires otherwise.inferred

    Configure Local Gateway on Cisco IOS XE for Webex Calling · dial-peer voice 100 and dial-peer voice 200 examples · Checked 2026-09-30
30. 30
    A registration-based Local Gateway on Cisco CUBE requires Cisco IOS XE 17.6.1a or later.

    Configure Local Gateway on Cisco IOS XE for Webex Calling · Prerequisites / trunk types · Checked 2026-09-30
31. 31
    For a registration-based trunk, CUBE's voice class tenant carries the Control Hub registrar domain, line/port credentials, digest authentication, TLS transport, the SRTP crypto class and source interfaces.

    Configure Local Gateway on Cisco IOS XE for Webex Calling · voice class tenant 100 (registration-based) · Checked 2026-09-30
32. 32
    The Local Gateway SBC for Webex Contact Center can be Cisco IOS XE or an approved third-party SBC, connected to Webex Calling over the internet or privately through Webex Edge Connect.

    Set up voice channels for Webex Contact Center · PSTN connectivity options > Webex Calling Local Gateway · Checked 2026-09-30
33. 33
    The Local Gateway's Webex-facing SRTP crypto class must offer AES_CM_128_HMAC_SHA1_80, the only suite Webex Calling supports.

    Configure Local Gateway on Cisco IOS XE for Webex Calling · voice class srtp-crypto 100 · Checked 2026-09-30
34. 34
    The Local Gateway signals to Webex Calling over SIP TLS 1.2 and needs the Cisco root CA bundle imported into the IOS XE trustpool.

    Configure Local Gateway on Cisco IOS XE for Webex Calling · Configure sip-ua; upload the Cisco root CA bundle · Checked 2026-09-30
35. 35
    Cisco lists show sip-ua register status and show voice class tenant as Local Gateway verification commands.

    Configure Local Gateway on Cisco IOS XE for Webex Calling · Verification commands · Checked 2026-09-30
36. 36
    Cisco's Local Gateway baseline under voice service voip includes ip address trusted list, allow-connections sip to sip, media statistics and early-offer forced.

    Configure Local Gateway on Cisco IOS XE for Webex Calling · voice service voip configuration · Checked 2026-09-30
37. 37
    A main number must be assigned to a Webex Calling location if the location has any trunks or extension-only entities.

    Configure Webex Calling for your organization · Main number requirement · Checked 2026-09-30
38. 38
    A location's PSTN connection is set to Premises-based PSTN in Control Hub under Management > Location > Manage by selecting Premises-based PSTN and choosing the trunk.

    Configure Webex Calling for your organization · Select a trunk for Premises-based PSTN · Checked 2026-09-30
39. 39
    A location's PSTN setup can be changed after creation, but no number management change can be made for a location undergoing a PSTN connection transition.

    Configure Webex Calling for your organization · Location settings; PSTN connection change · Checked 2026-09-30
40. 40
    Cisco sets maximums of 100 ms one-way latency, 10 ms jitter and 0.5 percent packet loss for consistent Local Gateway call quality.

    Get started with Local Gateway · Network requirements · Checked 2026-09-30
41. 41
    Calls reach Webex Contact Center through Webex Calling PSTN services, which do not require a Webex Calling subscription, and all new Webex Contact Center subscriptions include Webex Calling PSTN services.

    Webex Contact Center Architecture · PSTN connectivity section · Checked 2026-09-30
42. 42
    Cisco does not support endpoint devices in the same Webex Calling location as Webex Contact Center PSTN.

    Set up voice channels for Webex Contact Center · Location configuration > creating PSTN location · Checked 2026-09-30
43. 43
    Webex Contact Center does not provide transcoding or media termination point services for calls using unsupported codecs.

    Set up voice channels for Webex Contact Center · Technical requirements > codec transcoding · Checked 2026-09-30
44. 44
    Phone numbers are added to a location under Services > PSTN & Routing > Numbers in E.164 format, with US numbers also accepted in national format.

    Manage phone numbers in Control Hub · Add phone numbers · Checked 2026-09-30
45. 45
    Only unassigned phone numbers can be deleted in bulk, and a number in a block cannot be deleted unless every number in that block is unassigned.

    Manage phone numbers in Control Hub · Delete phone numbers · Checked 2026-09-30
46. 46
    An inactive number assigned to a feature, user or workspace stays inactive until it is activated.

    Manage phone numbers in Control Hub · Number status: active and inactive · Checked 2026-09-30
47. 47
    The Webex Contact Center PSTN signaling table lists Delayed Offer as supported, Early Offer and Early Media as not supported, and a 20 ms packetization time in SDP.

    Set up voice channels for Webex Contact Center · Technical requirements > PSTN media and signaling standards · Checked 2026-09-30
48. 48
    A dial number must be mapped to an entry point before it can be the Default Outdial ANI; otherwise the Default Outdial ANI field shows Not Configured.

    Set up voice settings for Webex Contact Center · Default Outdial ANI · Checked 2026-09-30
49. 49
    Local Gateway SRTP media uses UDP source ports 8000-48199 outbound to Webex Calling destination ports including 5004, 9000, 8500-8699 and 19560-65535, and inbound UDP 19560-65535.

    Port Reference Information for Webex Calling · Local Gateway media rows · Checked 2026-09-30
50. 50
    The Local Gateway opens outbound SIP TLS over TCP to Webex Calling on port 8934 for a registration-based trunk or 5062 for a certificate-based trunk, and a certificate-based gateway must also accept inbound TCP 8934 from Webex Calling.

    Port Reference Information for Webex Calling · Local Gateway signaling rows · Checked 2026-09-30
51. 51
    For Local Gateway deployments, outbound dial plans for premises destinations are created under Calling > Call Routing > Dial Plans with a name, routing choice and patterns.

    Set up voice channels for Webex Contact Center · Dial plan configuration (Local Gateway) · Checked 2026-09-30
52. 52
    Premises-based PSTN through a Local Gateway keeps the current PSTN provider, and the same trunks can also connect to premises PBXs.

    Configure trunks, route groups, and dial plans for Webex Calling · Set location PSTN connection > Premises-based PSTN · Checked 2026-09-30
53. 53
    Prerequisites include recording the organization name and ID from Account > Organization Profile, which are needed for TAC cases, and completing the initial Webex Contact Center tenant setup.

    Set up voice channels for Webex Contact Center · Prerequisites > organization and initial tenant setup · Checked 2026-09-30
54. 54
    Before setting up voice channels, an administrator needs valid Contact Center Standard or Premium agent subscriptions, plus a Calling subscription for agents who use Webex devices or the Webex App, checked under Account > Subscriptions.

    Set up voice channels for Webex Contact Center · Prerequisites > subscription verification · Checked 2026-09-30
55. 55
    Webex Contact Center can keep media within the local region where its voice media edge and ingress services run, which Cisco hosts in several AWS regions including the US, Canada, UK, Europe, Asia Pacific and India.

    Webex Contact Center Architecture · Media path and regional considerations · Checked 2026-09-30
56. 56
    A route group is a group of up to 10 trunks that lets Webex Calling distribute calls across trunks or provide redundancy, with priority weights set per trunk.

    Configure trunks, route groups, and dial plans for Webex Calling · Route groups section · Checked 2026-09-30
57. 57
    Cisco recommends turning off SIP ALG on firewalls in the Webex Calling path because some implementations break firewall traversal.

    Port Reference Information for Webex Calling · SIP ALG note · Checked 2026-09-30
58. 58
    When the telephony type is Cisco PSTN and the tenant lacks the Bundle 2 inbound toll-free number access add-on, a toll number should be used to map an entry point.

    Set up voice settings for Webex Contact Center · Set up inbound dial numbers · Checked 2026-09-30
59. 59
    A registration-based Local Gateway trunk carries up to 250 concurrent calls; deployments needing more than 250 concurrent calls per trunk require a certificate-based trunk.

    Set up voice channels for Webex Contact Center · Trunk and route group configuration > concurrent call capacity · Checked 2026-09-30
60. 60
    A trunk is added in Control Hub under Services > Calling > Call Routing > Trunk > Add Trunk by choosing a location, a name of at most 24 characters, and a trunk type of Registration-based or Certificate-based.

    Configure trunks, route groups, and dial plans for Webex Calling · Create a trunk · Checked 2026-09-30
61. 61
    Creating a registration-based trunk yields a register domain, trunk group OTG/DTG, line/port, outbound proxy address, username and password; lost credentials must be regenerated from the trunk information screen.

    Configure trunks, route groups, and dial plans for Webex Calling · Create a trunk > generated credentials · Checked 2026-09-30
62. 62
    A trunk can be deleted from Services > Calling > Call Routing > Trunk via More Options > Delete Trunk as long as it is not in use.

    Configure trunks, route groups, and dial plans for Webex Calling · Delete a trunk · Checked 2026-09-30
63. 63
    Control Hub shows trunk status as Online (all Webex Calling edge proxies connected), Impaired (at least one proxy failing), Offline (no connection) or Unknown (connection in progress), refreshed every 3 minutes.

    Configure trunks, route groups, and dial plans for Webex Calling · Trunk status · Checked 2026-09-30
64. 64
    A valid Webex Calling subscription is required for agents who use Webex devices or the Webex App.

    Set up voice channels for Webex Contact Center · Webex Calling Configuration Checklist > Active Subscriptions · Checked 2026-09-30
65. 65
    Cisco's Webex Calling configuration checklist for Webex Contact Center says to confirm under Contact Center > Settings > Service Details that the voice media platform is Real Time Media Service and telephony is Webex Calling.

    Set up voice channels for Webex Contact Center · Webex Calling Configuration Checklist > Service Details · Checked 2026-09-30
66. 66
    Because the tenant's telephony selection is locked after activation and the administrator cannot correct it, checking Service Details before any other configuration avoids building locations and entry points on a tenant that Cisco must first reprovision.inferred

    Set up voice channels for Webex Contact Center · section Verification of Webex Contact Center Service Details · Checked 2026-09-24
67. 67
    A tenant whose service details are wrong should be raised with the Cisco account team, customer success manager or partner, because the administrator cannot self-correct the telephony selection.

    Set up voice channels for Webex Contact Center · Verification of Webex Contact Center Service Details · Checked 2026-09-16
68. 68
    Webex Contact Center PSTN is available in the contiguous United States and Canada only.

    Set up voice channels for Webex Contact Center · PSTN connectivity options > Webex Contact Center PSTN · Checked 2026-09-30
69. 69
    For Cisco-provided Webex Contact Center PSTN, mapping toll-free numbers requires the Bundle 2 inbound toll-free number access add-on; without it toll numbers must be used.

    Set up voice settings for Webex Contact Center · Map dial numbers to entry points (entitlement note) · Checked 2026-09-30
70. 70
    A registration-based Webex Calling Local Gateway processes up to 250 concurrent calls into Webex Contact Center, and deployments needing more than 250 concurrent calls including IVR and agent legs must select a certificate-based trunk.

    Set up voice channels for Webex Contact Center · Configuration of Webex Local Gateway / Session Border Controller Configuration for Local Gateway Connectivity · Checked 2026-09-16
71. 71
    Introducing a second upstream PSTN carrier that forwards calls to an intermediary carrier before Webex Contact Center is not a supported configuration for Cloud Connected PSTN, Local Gateway or Webex Contact Center PSTN.

    Set up voice channels for Webex Contact Center · PSTN Call Forwarding Scenarios and Best Practices · Checked 2026-09-30
72. 72
    Creating a Webex Calling location requires a unique location name, a country or region, a full address, announcement and email languages, and a time zone.

    Configure Webex Calling for your organization · location setup procedure, add location fields · Checked 2026-09-24
73. 73
    Cisco does not support endpoint devices in the same Webex Calling location as Webex Contact Center PSTN and warns this may cause unexpected overage charges.

    Set up voice channels for Webex Contact Center · Configuration of Webex Contact Center PSTN Locations · Checked 2026-09-30
74. 74
    A dedicated Webex Calling location is created for Contact Center PSTN, and Cisco does not support endpoint devices in the same location as Webex Contact Center PSTN.

    Set up voice channels for Webex Contact Center · Set up voice channels > Location configuration · Checked 2026-09-30
75. 75
    Additional Webex Calling locations are created in Control Hub under Management, Location, after the First Time Setup Wizard has created the initial location.

    Configure Webex Calling for your organization · location setup procedure, navigation step · Checked 2026-09-24
76. 76
    A Webex Calling location's PSTN connection is set on the location's Calling tab by choosing Cisco PSTN, Cloud Connected PSTN, or Premises-based PSTN through a Local Gateway.

    Configure Webex Calling for your organization · section on PSTN connection for a location · Checked 2026-09-24
77. 77
    Assigning a main number to a Webex Calling location is mandatory if the location has any trunks or extension-only entities, and the main number serves as the location's default caller ID.

    Configure Webex Calling for your organization · section on the location main number · Checked 2026-09-24
78. 78
    On CUBE, TLS 1.2 can be enforced globally with 'transport tcp tls v1.2' (minimum form) under sip-ua, ciphers are listed in voice class tls-cipher and bound with a trustpoint in voice class tls-profile, and a voice class tenant can apply the tls-profile with 'session transport tcp tls' and 'listen-port secure'.

    Cisco Unified Border Element Configuration Guide - Cisco IOS XE 17.6 Onwards - SIP TLS Support · TLS cipher, TLS profile and SIP-UA/tenant configuration sections · Checked 2026-09-30
79. 79
    CUBE ICE-Lite is configured with voice class stun-usage <tag> and 'stun usage ice lite', and Cisco lists IPv6, ANAT, codec transparent, SDP passthrough, media flow-around, MTP and TCL/VXML scripts as unsupported with it.

    Cisco Unified Border Element Configuration Guide - Cisco IOS XE 17.6 Onwards: ICE-Lite Support · Restrictions; Configuring ICE-Lite · Checked 2026-09-30
80. 80
    A CUBE voice class tenant acts as a per-trunk configuration template applied with voice-class sip tenant <tag>, and settings resolve in the order dial-peer, then tenant, then global.

    Cisco Unified Border Element Configuration Guide - Cisco IOS XE 17.6 Onwards - Configure Multiple Trunks Using Tenants · Overview; configuration precedence · Checked 2026-09-30
81. 81
    CUBE's voice class srtp-crypto lists preferred SRTP suites (AEAD_AES_256_GCM, AEAD_AES_128_GCM, AES_CM_128_HMAC_SHA1_80, AES_CM_128_HMAC_SHA1_32) and can be applied globally under voice service voip sip, in a voice class tenant, or per dial-peer with voice-class sip srtp-crypto, with 'srtp' enabling secure calls on the dial-peer.

    Cisco Unified Border Element Configuration Guide - Cisco IOS XE 17.6 Onwards - SRTP-SRTP Interworking · Voice class srtp-crypto configuration; application at global, tenant and dial-peer levels · Checked 2026-09-30
82. 82
    Cisco's CUBE SIP TLS chapter builds the CUBE identity by generating an RSA key pair and a crypto pki trustpoint with rsakeypair, fqdn, subject-name CN, subject-alt-name, enrollment terminal and revocation-check settings.

    Cisco Unified Border Element Configuration Guide - Cisco IOS XE 17.6 Onwards - SIP TLS Support · Certificate creation / trustpoint configuration section · Checked 2026-09-30
83. 83
    Local Gateway trunk status in Control Hub updates every 3 minutes.

    Configure trunks, route groups, and dial plans for Webex Calling · Trunk status · Checked 2026-09-30
84. 84
    Control Hub shows a Local Gateway trunk as Online, Offline, Impaired (at least one Webex Calling Edge proxy cannot connect) or Unknown (connection in progress for a new gateway).

    Configure trunks, route groups, and dial plans for Webex Calling · Trunk status · Checked 2026-09-30
85. 85
    Cisco warns administrators to configure only the numbers allocated to their Webex Contact Center PSTN connection because entering invalid numbers may result in call routing failures.

    Set up voice channels for Webex Contact Center · Configuration of Webex Contact Center PSTN numbers (warning note) · Checked 2026-09-30
86. 86
    Premises-based PSTN DIDs or toll-free numbers configured in Control Hub for Local Gateway are saved in +E.164 format.

    Set up voice channels for Webex Contact Center · Local Gateway number requirements · Checked 2026-09-30
87. 87
    Inbound telephony entry points are created in Control Hub under Services, Contact Center, Customer Experience, Channels.

    Set up a channel · procedure Create a channel, navigation step · Checked 2026-09-24
88. 88
    An inbound voice entry point is created with channel type Inbound Telephony and a routing flow selected from a drop-down, and its timezone defaults to the tenant timezone.

    Set up a channel · procedure Create a channel, Channel Type, Timezone and Routing Flow fields · Checked 2026-09-24
89. 89
    In Flow Designer a flow must be validated and its errors fixed before it can be published.

    Build and manage flows with Flow Designer · Flow Designer interface > Footer pane (validation and publish) · Checked 2026-09-30
90. 90
    The Webex Contact Center system limits table sets a maximum of 6000 active entry points per tenant.

    System limits in Webex Contact Center · Table 1. Maximum system limits for configuration entities and attributes > Entry points > Active · Checked 2026-09-30
91. 91
    The Webex Contact Center system limits table allows at most 500 dialed numbers per entry point and 15000 dialed number to entry point mappings per tenant.

    System limits in Webex Contact Center · Table 1 > Dialed numbers > Entry Point; Per entry point · Checked 2026-09-30
92. 92
    Webex Contact Center system limits allow 6000 active entry points, 1000 active outdial entry points, 15000 dialed numbers configured as entry points in total and 500 dialed numbers per entry point.

    System limits in Webex Contact Center · Table 1. Maximum system limits for configuration entities and attributes - entry point and dialed number rows · Checked 2026-09-16
93. 93
    The Webex Calling location main number does not appear in the list of numbers available for dial number to entry point mapping.

    Set up voice settings for Webex Contact Center · Map dial numbers to entry points (note under Available numbers/DN) · Checked 2026-09-30
94. 94
    A Webex Calling location's main number does not appear in the list of numbers available for entry point mapping, so using it for mapping requires changing the location's main number.

    Set up voice settings for Webex Contact Center · section on numbers available from Webex Calling locations · Checked 2026-09-24
95. 95
    A July 24 2026 admin update added the ability to search and sort phone numbers associated with an entry point in Control Hub.

    What's new for administrators in Webex Contact Center · July 24 2026 entry > admin experience improvements · Checked 2026-09-30
96. 96
    Entry point configuration includes a routing flow selection and a Version Label field that chooses which version of that flow the entry point runs.

    Set up a channel · Set up a channel > Entry point settings > Routing Flow; Version Label · Checked 2026-09-30
97. 97
    Dial numbers are mapped to entry points in Control Hub under Contact Center > Tenant Settings > Voice by selecting an available number or DN and the target entry point.

    Set up voice settings for Webex Contact Center · Map dial numbers to entry points (Tenant Settings > Voice) · Checked 2026-09-30
98. 98
    The tenant-wide default outdial ANI is set in Control Hub under Tenant Settings, Voice, and a dial number must be mapped to an entry point before it can be chosen as the default outdial ANI.

    Set up voice settings for Webex Contact Center · section Default Outdial ANI · Checked 2026-09-24
99. 99
    A dial number must be mapped to an entry point to be available as the Default Outdial ANI.

    Set up voice settings for Webex Contact Center · Set up voice settings > Default Outdial ANI · Checked 2026-09-30
100. 100
     By default, the first dial number mapped to an entry point is displayed as the Default Outdial ANI; if no dial number is mapped to an entry point, the field shows Not Configured.

     Set up voice settings for Webex Contact Center · Set up voice settings > Default Outdial ANI · Checked 2026-09-30
101. 101
     By default the first dial number mapped to an entry point is shown as the default outdial ANI, and if no dial number is mapped to an entry point the field reads Not Configured.

     Set up voice settings for Webex Contact Center · section Default Outdial ANI · Checked 2026-09-24
102. 102
     Outdial ANI lists are created in Control Hub under Services > Contact Center > Desktop Experience > Outdial ANI, by clicking Create Outdial ANI.

     Manage Outdial ANI · Manage Outdial ANI > Create an outdial ANI, step 1 · Checked 2026-09-30
103. 103
     Numbers in an outdial ANI list must be dial numbers assigned to entry points; the contact number drop-down shows only dial numbers mapped to entry points.

     Manage Outdial ANI · Manage Outdial ANI > Create an outdial ANI > Contact Number · Checked 2026-09-30
104. 104
     Desktop profiles are created in Control Hub under Services > Contact Center > Desktop experience > Desktop profiles, by clicking Create desktop profile.

     Manage desktop profiles · Manage desktop profiles > Create a desktop profile · Checked 2026-09-30
105. 105
     The desktop profile's Outdial ANI field selects the outdial ANI list of phone numbers the agent can use as caller ID for outdial calls.

     Manage desktop profiles · Manage desktop profiles > Voice settings > Outdial ANI · Checked 2026-09-30
106. 106
     A dial number must be mapped to an entry point to be available as the default outdial ANI, and the Default Outdial ANI field shows Not Configured when the number is not mapped.

     Set up voice settings for Webex Contact Center · Call Settings > Default Outdial ANI · Checked 2026-09-30
107. 107
     Webex Contact Center PSTN requirements specify RFC 2833 DTMF and a 20 ms packetization time in the SDP.

     Set up voice channels for Webex Contact Center · PSTN Media and Signaling Requirements > DTMF; Packetization Timer in SIP SDP · Checked 2026-09-30
108. 108
     Agents can make outdial calls from the Available or Idle state but cannot start an outdial call while on an active inbound voice call.

     Make an outdial call · Make an outdial call > Before you begin / notes · Checked 2026-09-30
109. 109
     Outdial numbers are limited to a maximum of 18 digits.

     Make an outdial call · Make an outdial call > notes on number format · Checked 2026-09-30
110. 110
     Agents cannot outdial to extension numbers or to entry point numbers.

     Make an outdial call · Make an outdial call > notes on number format · Checked 2026-09-30
111. 111
     If an agent does not select a specific outdial ANI for an outdial call, the customer's caller ID shows the default outdial ANI dial number.

     Set up voice settings for Webex Contact Center · Set up voice settings > Default Outdial ANI · Checked 2026-09-30
112. 112
     Calls reaching the Webex Contact Center media edge must use G.711uLaw or G.711aLaw.

     Set up voice channels for Webex Contact Center · PSTN Media and Signaling Requirements for Webex Contact Center · Checked 2026-09-16
113. 113
     Control Hub's Webex Calling call troubleshooting view shows calls from the past 21 days and includes PSTN legs through Cloud Connected PSTN and Local Gateway with trunk and route group details.

     Troubleshoot Webex Calling calls in Control Hub · Troubleshoot calls > search and call legs · Checked 2026-09-30
114. 114
     A Webex Calling Local Gateway lets a customer retain their current on-premises PSTN carrier while providing access in over 140 markets globally, with third-party session border controllers supported alongside Cisco CUBE.

     Set up voice channels for Webex Contact Center · Connect to Webex Calling Services - PSTN Services - Webex Calling Local Gateway · Checked 2026-09-16
115. 115
     The Set up a channel article states that Webex Contact Center supports mapping only PSTN numbers in globalized +E.164 format to entry points and that extensions are not supported for this mapping.disputed

     Set up a channel · Set up a channel > inbound telephony entry point > Support Number step · Checked 2026-09-30
116. 116
     The Webex Calling based voice channel setup article states that an inbound entry point requires a Webex Calling location and a PSTN region, and can be populated with a PSTN number, an extension number, or both.disputed

     Set up voice channels for Webex Contact Center · Configuration of Inbound Entry Points to Webex Contact Center · Checked 2026-09-30
117. 117
     Cisco Calling Plan is supported with Webex Contact Center only in regions where Webex Calling supports service numbers and for Webex Contact Center trials, with Cisco operating as the PSTN carrier in a single bill.

     Set up voice channels for Webex Contact Center · Connect to Webex Calling Services - PSTN Services - Cisco Webex Calling Plan · Checked 2026-09-16
118. 118
     SIP Delayed Offer is supported toward Webex Contact Center while SIP Early Offer and SIP Early Media are not supported and are described as roadmap items.

     Set up voice channels for Webex Contact Center · PSTN Media and Signaling Requirements for Webex Contact Center · Checked 2026-09-16

Documents

Cite this page

WarmTransfer. (2026, September 30). Setting up bring-your-own PSTN for Webex Contact Center. WarmTransfer. https://warmtransfer.net/guides/wxcc-byo-pstn-setup

@misc{warmtransfer-wxcc-byo-pstn-setup,
  title  = {Setting up bring-your-own PSTN for Webex Contact Center},
  author = {{WarmTransfer}},
  year   = {2026},
  url    = {https://warmtransfer.net/guides/wxcc-byo-pstn-setup},
  note   = {Verified 2026-09-30}
}