AT&T IP Flexible Reach SIP trunking

See also

Sources

1. 1
   AT&T does not warrant that customer equipment or software reviewed in its customer configuration guides, such as an IP PBX, will work with IP Flexible Reach to complete 911/E911 calls; verifying this is the customer's responsibility with its equipment vendor.

   AT&T IP Flexible Reach Service (on ADI/PNT) · 911 Emergency Service section · Checked 2026-10-14
2. 2
   AT&T IP Flexible Reach requires either AT&T Dedicated Internet Service (ADI) or AT&T Virtual Private Network (AVPN) as the high-speed dedicated access to the AT&T network.

   SIP Trunking and Phone Service with AT&T IP Flexible Reach · FAQ: With AT&T IP Flexible Reach, how do I connect to the AT&T network? · Checked 2026-10-14
3. 3
   IP Flexible Reach account codes track calls against accounts and can be mandatory (required on every call outside the group) or optional.

   AT&T IP Flexible Reach Customer Portal: User Support - FAQ · FAQ: What is the difference between mandatory and optional account codes?; What are account codes used for? · Checked 2026-10-14
4. 4
   AT&T's ADI/PNT implementation portal for IP Flexible Reach defines four phases: Getting Started, Technical Interview, Site Preparation, and Test and Turn-up.

   AT&T IP Flexible Reach Service (on ADI/PNT) Implementation Phases · Implementation Phases headings 1-4 · Checked 2026-10-14
5. 5
   The configuration guides and questionnaires linked from the ADI/PNT implementation page carry printed dates between 3/15/06 and 3/31/2010.

   AT&T IP Flexible Reach Service (on ADI/PNT) Implementation Phases · Site Preparation: IP PBX Configuration Guides and Technical Interview link labels · Checked 2026-10-14
6. 6
   When authorization codes are provisioned for an IP Flexible Reach group, members must enter a code on calls outside the group, except emergency or repair calls.

   AT&T IP Flexible Reach Customer Portal: User Support - FAQ · FAQ: What are authorization codes used for? · Checked 2026-10-14
7. 7
   AT&T lists a Border Gateway Protocol Resiliency and Call Preservation CCG for IP Flexible Reach and IP Toll-Free with AT&T VPN as the underlying transport; its file path carries a September 2021 date.

   AT&T IP Flexible Reach Service (on AVPN) Implementation Support · Additional AT&T-Provided Guides: Border Gateway Protocol Resiliency & Call Preservation CCG · Checked 2026-10-14
8. 8
   IP Flexible Reach branch office extensions let a customer share trunks across multiple locations.

   SIP Trunking and Phone Service with AT&T IP Flexible Reach · Better utilize network capacity > feature table > Branch office extensions · Checked 2026-10-14
9. 9
   IP Flexible Reach bursting and sharing lets calls exceed a trunk's maximum by using call capacity from another group trunk group in the same enterprise.

   About Trunk Burst · About Trunk Burst, opening paragraph · Checked 2026-10-14
10. 10
    A group trunk group's burst cannot exceed 20% of that group trunk group's maximum concurrent call limit.

    About Trunk Burst · About Trunk Burst, limit sentence · Checked 2026-10-14
11. 11
    Trunk bursting and sharing is initially set to false, is managed by AT&T, and enabling or changing it requires contacting the AT&T account representative.

    About Trunk Burst · About Trunk Burst, default and change sentences; Trunk Burst setting · Checked 2026-10-14
12. 12
    AT&T publishes a CER CCG for Certified IP-PBX Solutions on AT&T IP Flexible Reach and AT&T IP Toll Free on AT&T VPN, using the term AT&T Certified IP-PBX Solutions.

    AT&T IP Flexible Reach Service (on AVPN) Implementation Support · Site Preparation > CER and TDM Gateway Guides; Additional AT&T-Provided Guides · Checked 2026-10-14
13. 13
    For IP Flexible Reach on AT&T VPN, AT&T lists Customer Edge Router (CER) configuration guides for Cisco ISR G1/7200/7300, ISR G2, ISR 4K, and ASR 1001/1002/1004/1006 platforms.

    AT&T IP Flexible Reach Service (on AVPN) Implementation Support · Site Preparation > CER and TDM Gateway Guides · Checked 2026-10-14
14. 14
    AT&T states IP Flexible Reach customers can increase and decrease the number of concurrent call channels and pay only for the lines they need.

    SIP Trunking and Phone Service with AT&T IP Flexible Reach · AT&T IP Flexible Reach benefits > Control costs · Checked 2026-10-14
15. 15
    AT&T's IP Flexible Reach training page lists an Encryption Addendum for the CUBE customer configuration guide.

    AT&T IP Flexible Reach Service (on ADI/PNT) Training and Reference · Customer Configuration Guides > Encryption Addendum for CUBE CCG · Checked 2026-10-14
16. 16
    AT&T lists a Media Flow Around addendum to its Cisco Unified Border Element customer configuration guide with AT&T Certified IP-PBX Solutions.

    AT&T IP Flexible Reach Service (on AVPN) Implementation Support · Additional AT&T-Provided Guides: Media Flow Around Addendum · Checked 2026-10-14
17. 17
    AT&T's implementation page lists Cisco application notes for CUCM 11.0 with ISR G2 (IOS 15.5.3 M1) and ISR 4K (15.5.3 S1) on AT&T IP Flexible Reach over IPv6, plus an ASR (15.5.3 S1) IPv4 note.

    AT&T IP Flexible Reach Service (on AVPN) Implementation Support · Vendor-Provided IP-PBX and SBC Guides > Cisco · Checked 2026-10-14
18. 18
    The IP Flexible Reach group profile dial plan type reflects the purchased AT&T service plan and is Public Only, Private Only, or Public & Private.

    AT&T IP Flexible Reach Customer Portal: End User Glossary · Glossary term: dial plan type · Checked 2026-10-14
19. 19
    IP Flexible Reach administrators can restrict a group's or individual's outgoing calls by call type, such as international or toll-free, and can require an authorization code for certain call types.

    AT&T IP Flexible Reach Customer Portal: User Support - FAQ · FAQ: What are dial restrictions, and how do they work? · Checked 2026-10-14
20. 20
    The Enterprise Administrator is the top administrator class in IP Flexible Reach and manages group trunk groups, trunk call routing schemes, Group and Department Administrators, and users.

    AT&T IP Flexible Reach Customer Portal: End User Glossary · Glossary term: enterprise administrator · Checked 2026-10-14
21. 21
    In IP Flexible Reach a group is a set of users sharing a group trunk group at their location, with its own location dialing code, extension length, assigned telephone numbers, and group ID and name.

    AT&T IP Flexible Reach Customer Portal: End User Glossary · Glossary term: group · Checked 2026-10-14
22. 22
    An Enterprise Administrator can set a group trunk group's Incoming Concurrent Calls and Outgoing Concurrent Calls in the portal, each not exceeding the group trunk group's maximum concurrent calls.

    View and Edit a Group Trunk Group Profile · Fields: Incoming Concurrent Calls; Outgoing Concurrent Calls · Checked 2026-10-14
23. 23
    A group trunk group's Forward Always Action can redirect calls that would use that group trunk group to a Phone Number or another Group Trunk Group, or be set to None.

    View and Edit a Group Trunk Group Profile · Field: Forward Always Action · Checked 2026-10-14
24. 24
    A group trunk group's Unreachable Destination Action, applied when an incoming call cannot be routed (for example the group trunk group is at capacity), can be None, Phone Number or Group Trunk Group.

    View and Edit a Group Trunk Group Profile · Field: Unreachable Destination Action · Checked 2026-10-14
25. 25
    AT&T instructs customers to download the configuration guide specific to their equipment vendor and software version.

    AT&T IP Flexible Reach Service (on AVPN) Implementation Support · Vendor-Provided IP-PBX and SBC Guides introduction · Checked 2026-10-14
26. 26
    AT&T states the CER and TDM gateway guides can be used for AT&T IP Flexible Reach, AT&T IP Toll-Free, or both at once.

    AT&T IP Flexible Reach Service (on AVPN) Implementation Support · Site Preparation section text · Checked 2026-10-14
27. 27
    AT&T lists a CER CCG for an integrated CER/CUBE (Cisco router acting as both customer edge router and Cisco Unified Border Element) with AT&T Certified IP-PBX Solutions.

    AT&T IP Flexible Reach Service (on AVPN) Implementation Support · Additional AT&T-Provided Guides: CER CCG for Integrated CER/CUBE with AT&T Certified IP-PBX Solutions · Checked 2026-10-14
28. 28
    Because AT&T publishes IPv6-specific CUCM/CUBE application notes for IP Flexible Reach, IPv6 SIP trunk interconnection was supported at least for the tested Cisco configurations; current IPv6 availability is not confirmed.inferred

    AT&T IP Flexible Reach Service (on AVPN) Implementation Support · Vendor-Provided IP-PBX and SBC Guides > Cisco (IPV6 titles) · Checked 2026-10-14
29. 29
    After test and turn-up completes, IP Flexible Reach (on ADI/PNT) moves to maintenance, and customers use AT&T BusinessDirect for change orders, trouble tickets and bills.

    AT&T IP Flexible Reach Service (on ADI/PNT) · Life Cycle section · Checked 2026-10-14
30. 30
    Max DID Policing limits concurrent inbound calls to a specific phone number, with Maximum Concurrent Calls for User set between 1 and 500.

    Max DID Policing · Introduction; To set Max DID Policing, step 6 · Checked 2026-10-14
31. 31
    AT&T markets IP Flexible Reach calls as carried on the AT&T MPLS network rather than the public internet.

    SIP Trunking and Phone Service with AT&T IP Flexible Reach · AT&T IP Flexible Reach benefits > Integrate voice and data into one integrated access circuit > Maintain call quality · Checked 2026-10-14
32. 32
    AT&T's public IP Flexible Reach implementation pages do not present a consolidated certified-equipment list in HTML; certification evidence appears to live inside PDF CCGs and vendor guides, so a current certified model list cannot be read from the HTML pages alone.inferred

    AT&T IP Flexible Reach Service (on AVPN) Implementation Support · whole page; compare att-corp-bvoip-ipflex-training Customer Configuration Guides · Checked 2026-10-14
33. 33
    AT&T states that on-net (VoIP to VoIP) IP Flexible Reach calls route within the IP network and do not incur additional charges.

    SIP Trunking and Phone Service with AT&T IP Flexible Reach · AT&T IP Flexible Reach benefits > Avoid toll charges · Checked 2026-10-14
34. 34
    IP Flexible Reach implementation phases begin after the contract is signed by both parties and the customer receives a Welcome Letter.

    AT&T IP Flexible Reach Service (on AVPN) Implementation Support · Implementation introduction above Site Preparation · Checked 2026-10-14
35. 35
    IP Flexible Reach includes a web-based portal for performance reporting, call detail reporting and e-ordering.

    SIP Trunking and Phone Service with AT&T IP Flexible Reach · Better utilize network capacity > feature table > Web-based portal · Checked 2026-10-14
36. 36
    When Capacity Management is enabled on a trunk call routing scheme, the smaller of its Maximum Active Calls Allowed and the group trunk group Maximum Concurrent Calls determines the concurrent calls allowed.

    Edit a Trunk Call Routing Scheme · Field: Capacity Management > Maximum Active Calls Allowed · Checked 2026-10-14
37. 37
    The % Allocation route algorithm is available only on created trunk call routing schemes, not the default scheme, and its percentages must total 100%.

    Edit a Trunk Call Routing Scheme · Field: Route Algorithm > % Allocation · Checked 2026-10-14
38. 38
    A trunk call routing scheme's Route Algorithm can be Linear, Round Robin, % Allocation or Most Idle.

    Edit a Trunk Call Routing Scheme · Field: Route Algorithm · Checked 2026-10-14
39. 39
    A trunk call routing scheme's Route Exhaust can be None (calls end after the maximum re-routes) or Trunk Forward (unanswered calls go to a specified phone number), and AT&T recommends test calls after setting Trunk Forward.

    Edit a Trunk Call Routing Scheme · Field: Route Exhaust · Checked 2026-10-14
40. 40
    AT&T lists TDM Gateway customer configuration guides for IP Flexible Reach on AT&T VPN for Cisco ISR G1, ISR G2 and ISR 4K.

    AT&T IP Flexible Reach Service (on AVPN) Implementation Support · Site Preparation > CER and TDM Gateway Guides · Checked 2026-10-14
41. 41
    AT&T states that existing IP Flexible Reach customers adding Microsoft Teams Direct Routing will not need to port their telephone numbers.

    AT&T IP Flexible Reach for Microsoft Teams Direct Routing · page body, porting sentence · Checked 2026-10-14
42. 42
    For Microsoft Teams, IP Flexible Reach can use the customer's premises-based Teams-certified session border controller or an SBC hosted and managed by AT&T.

    SIP Trunking and Phone Service with AT&T IP Flexible Reach · FAQ: Why utilize AT&T SIP Trunking with Microsoft Teams? · Checked 2026-10-14
43. 43
    In the Technical Interview phase an AT&T Order Manager contacts the customer to review the desired configuration and collect the information needed to place the service order, using AT&T technical questionnaires.

    AT&T IP Flexible Reach Service (on ADI/PNT) Implementation Phases · Phase 2 Technical Interview · Checked 2026-10-14
44. 44
    AT&T publishes separate test and turn-up checklists for IP Flexible Reach Calling Plan A, Calling Plans B and C, and Branch Office customers.

    AT&T IP Flexible Reach Service (on ADI/PNT) Implementation Phases · Phase 4 Test and Turn-up linked documents · Checked 2026-10-14
45. 45
    One customer's pre-turn-up check notes that AT&T IP Border Elements do not answer traceroute, so success is judged by replies from the default gateway and AVPN provider-edge subnet.field report

    AT&T IP Flex Service Setup · Pre-TTU check · Checked 2026-10-14
46. 46
    One customer ordered 12 concurrent calls split as 6 per SIP connection and recommends no more than 6 per SIP connection to limit billing impact under its contract.field report

    AT&T IP Flex Service Setup · Technical requirements: call paths · Checked 2026-10-14
47. 47
    One customer reports that the IP Flexible Reach order confirmation supplies IP addressing, a dial plan ID, test numbers and AT&T Border Element details used to configure the customer SBC.field report

    AT&T IP Flex Service Setup · Setup steps: order and provisioning; equipment · Checked 2026-10-14
48. 48
    One customer reports that AT&T's turn-up engineer verifies SIP sessions to the Border Elements, the test numbers, and inbound plus local, long-distance and international outbound calls, in two-hour turn-up blocks.field report

    AT&T IP Flex Service Setup · Turn-up testing · Checked 2026-10-14
49. 49
    Several vendor configuration guides for IP Flexible Reach on AVPN (for example NEC, Mitel, Unify OpenScape Voice and Toshiba) require a vendor login, credentials or dealer access.

    AT&T IP Flexible Reach Service (on AVPN) Implementation Support · Vendor-Provided IP-PBX and SBC Guides > Mitel, NEC, Unify, Toshiba entries · Checked 2026-10-14
50. 50
    IP Flexible Reach offers virtual telephone numbers (VTNs), which assign a telephone number to a phone not physically located in that number's local calling area.

    SIP Trunking and Phone Service with AT&T IP Flexible Reach · Better utilize network capacity > feature table > Virtual telephone numbers (VTNs) · Checked 2026-10-14

Documents

Cite this page

WarmTransfer. (2026, October 14). AT&T IP Flexible Reach SIP trunking. WarmTransfer. https://warmtransfer.net/knowledge/att-ip-flexible-reach

@misc{warmtransfer-att-ip-flexible-reach,
  title  = {AT&T IP Flexible Reach SIP trunking},
  author = {{WarmTransfer}},
  year   = {2026},
  url    = {https://warmtransfer.net/knowledge/att-ip-flexible-reach},
  note   = {Verified 2026-10-14}
}