Wholesale SIP trunk providers compared

See also

Sources

1. 1
   Bandwidth allows a maximum of 128 SIP peers per account for 911 service with no limit on the number of accounts.

   SIP peers for 911 service · Maximum SIP peers section · Checked 2026-10-14
2. 2
   Bandwidth names G.711 u-law/a-law as the primary supported codec for 911 and advises offering only that voice codec and no fax protocols such as UDPTL.

   Supported configurations for emergency calling · Audio codecs section · Checked 2026-10-14
3. 3
   Bandwidth accepts emergency calling traffic only from provisioned static IP addresses or subnets and does not support FQDNs or DNS hosts as 911 SIP peers.

   Supported configurations for emergency calling · IPs and ports section · Checked 2026-10-14
4. 4
   Bandwidth does not support SIP REFER on emergency calls and directs customers to use re-INVITE instead.

   Supported configurations for emergency calling · Supported methods section · Checked 2026-10-14
5. 5
   Bandwidth advises turning off SIP registration and digest authentication toward its emergency calling service.

   Supported configurations for emergency calling · Supported methods section · Checked 2026-10-14
6. 6
   Bandwidth supports SIP OPTIONS toward its emergency service but asks that they be sent no more than once per 60 seconds.

   Supported configurations for emergency calling · Supported methods section · Checked 2026-10-14
7. 7
   Bandwidth accepts emergency calling traffic only on destination port 5060 though the source port may be any port by default.

   Supported configurations for emergency calling · IPs and ports section · Checked 2026-10-14
8. 8
   When one IP must serve multiple Bandwidth accounts for 911 the preferred way to identify the trunk is an X-Account-Id SIP header with prepending the trunk ID to the Request-URI as the alternative.

   SIP peers for 911 service · Trunk ID section · Checked 2026-10-14
9. 9
   In Bandwidth Dynamic Location Routing the endpoint's default location serves taxation and location of record while the location conveyed in the call-time SIP INVITE defines 911 routing.

   Dynamic Location Routing · Endpoints section, default location note · Checked 2026-10-14
10. 10
    Bandwidth Dynamic Location Routing accepts only US and Canada addresses validated against USPS or Canada Post values.

    Dynamic Location Routing · Address fields / Country field limits · Checked 2026-10-14
11. 11
    Bandwidth's carrier FAQ states a FOC is valid for 10 business days counting the FOC date as day one and an LSR not activated in that window fails.

    Frequently Asked Questions (carriers) · FAQ: porting timelines / FOC validity · Checked 2026-10-14
12. 12
    Bandwidth does not provide early concurrence and auto-concurs about 6 hours after subscriptions are built so early activation requires supplementing the order with a new date.

    Frequently Asked Questions (carriers) · FAQ: I've got FOC, can I activate now? · Checked 2026-10-14
13. 13
    Bandwidth's port-in sequence is check portability then create the request then upload LOA then submit then receive FOC then activate on FOC day.

    Port-Ins · High-level steps list · Checked 2026-10-14
14. 14
    The FCC porting-interval rule defines intermodal ports to include ports involving interconnected VoIP service.

    47 CFR 52.35 Porting intervals · 47 CFR 52.35(e)(2)(iii) · Checked 2026-10-14
15. 15
    US carriers must complete a simple wireline-to-wireline or simple intermodal port request within one business day unless the new provider or the customer asks for a longer interval.

    47 CFR 52.35 Porting intervals · 47 CFR 52.35(a) · Checked 2026-10-14
16. 16
    The 47 CFR 9.11(b) interconnected VoIP 911 requirements apply on or after January 6 2021 for fixed services and January 6 2022 for non-fixed services.

    47 CFR part 9 — 911 Requirements · 47 CFR 9.11(b) introductory text · Checked 2026-10-14
17. 17
    Fixed interconnected VoIP providers must provide automated dispatchable location with each 911 call.

    47 CFR part 9 — 911 Requirements · 47 CFR 9.11(b)(4)(i) · Checked 2026-10-14
18. 18
    Non-fixed interconnected VoIP providers must provide automated dispatchable location where technically feasible and otherwise may use Alternative Location Information or a Registered Location or national emergency call center routing.

    47 CFR part 9 — 911 Requirements · 47 CFR 9.11(b)(4)(ii)(A)-(D) · Checked 2026-10-14
19. 19
    Interconnected VoIP providers must route all 911 calls using ANI (and pseudo-ANI if necessary) over the dedicated Wireline E911 Network, with first routing to a national emergency call center permitted when the caller's location cannot be obtained or confirmed.

    47 CFR part 9 — 911 Requirements · 47 CFR 9.11(b)(2)(iii) · Checked 2026-10-14
20. 20
    Of the three providers reviewed only Twilio publicly documents trunk emergency calling outside the US and Canada; Telnyx and Bandwidth emergency documents reviewed here are US-only or US/Canada-only.inferred

    Emergency Calling for SIP Trunking · Supported countries section; compare bandwidth-dev-dynamic-location-routing Country field and telnyx-docs-dynamic-e911 examples · Checked 2026-10-14
21. 21
    For Telnyx Dynamic E911 the address's sip_geolocation_id goes in the Geolocation header and the endpoint's sip_from_id goes in the From or P-Asserted-Identity header.

    Emergency Calling: Dynamic E911 · API steps / SIP headers section · Checked 2026-10-14
22. 22
    Telnyx lists emergency calling on its US elastic SIP pricing at 1.50 USD per number per month.

    SIP Trunking Pricing · Optional features, Emergency calling row · Checked 2026-10-14
23. 23
    Telnyx recommends pre-provisioning a persistent emergency address because a 911 call placed before an endpoint is activated is routed to a national emergency call center.

    Emergency Calling: Dynamic E911 · Provisioning delay warning · Checked 2026-10-14
24. 24
    Telnyx Dynamic E911 supports pre-provisioned API addresses for fixed sites and GPS coordinates sent as PIDF-LO in the SIP INVITE for mobile devices.

    Emergency Calling: Dynamic E911 · Location methods section · Checked 2026-10-14
25. 25
    Telnyx developer documentation states port-ins range from same-day for FastPort-eligible numbers to several weeks for international ports.

    Porting: Getting Started · Overview section · Checked 2026-10-14
26. 26
    Telnyx states requested FOC dates are not guaranteed because the losing carrier determines the actual activation date.

    Porting: Getting Started · Constraints section · Checked 2026-10-14
27. 27
    Telnyx's Growth plan with a 2000 USD monthly minimum lists 24/7 support via chat or call.

    SIP Trunking Pricing · Plans section, Growth plan · Checked 2026-10-14
28. 28
    Telnyx outbound voice profiles cover 255 destinations across 10 regions enabled by region or by individual country.

    Outbound Voice Profiles · Destinations section · Checked 2026-10-14
29. 29
    Each Telnyx outbound voice profile has a channel limit capping concurrent outbound calls with one channel per active call.

    Outbound Voice Profiles · Channel limits section · Checked 2026-10-14
30. 30
    Telnyx states many outbound destinations require Level 2 account verification before activation.

    Outbound Voice Profiles · Destinations section · Checked 2026-10-14
31. 31
    A Telnyx outbound voice profile can set a maximum per-minute destination rate and calls to destinations above it are rejected.

    Outbound Voice Profiles · Billing configuration section · Checked 2026-10-14
32. 32
    Telnyx supports only the LIS and ASSIST PIDF-LO methods and requires WGS84 (EPSG 4326) latitude-then-longitude coordinates.

    Emergency Calling: Dynamic E911 · PIDF-LO requirements section · Checked 2026-10-14
33. 33
    Telnyx requires a Letter of Authorization and a recent invoice for most port orders and requires numbers to pass a portability check before an order is created.

    Porting: Getting Started · Constraints section · Checked 2026-10-14
34. 34
    Telnyx's elastic SIP pricing page advertises 0 USD support.

    SIP Trunking Pricing · Page header badges · Checked 2026-10-14
35. 35
    Dialing 933 over a Twilio trunk reaches an automated system that reads back the calling Twilio number and its associated emergency address.

    Emergency Calling for SIP Trunking · Testing / 933 section · Checked 2026-10-14
36. 36
    Twilio lists emergency calling for Elastic SIP Trunking at 0.75 USD per number per month in the US.

    SIP Trunking Pricing - United States · Emergency calling row · Checked 2026-10-14
37. 37
    Since June 2021 Twilio delivers emergency calls from US and Canadian Twilio numbers on Elastic SIP Trunking even without an emergency address by routing them to a national emergency call center.

    Elastic SIP Trunking: emergency calls will always get routed in the US and Canada · Changelog entry Jun. 30 2021 body · Checked 2026-10-14
38. 38
    Twilio Elastic SIP Trunking emergency calling routes calls to PSAPs in the US and Canada and the UK and Australia and Ireland and France and Germany and Austria.

    Emergency Calling for SIP Trunking · Supported countries section · Checked 2026-10-14
39. 39
    In the US and Canada Twilio Elastic SIP Trunking supports both Enhanced 911 (number and address delivered to the dispatcher) and Basic 911 (the dispatcher learns number and address only if the caller states them).

    Emergency Calling for SIP Trunking · E911 vs Basic 911 section · Checked 2026-10-14
40. 40
    A Twilio Elastic SIP Trunking emergency call must carry a From header with an E.164 SIP URI of a Twilio number enabled for emergency calling and must dial an emergency number of the same country as that number.

    Emergency Calling for SIP Trunking · Requirements section · Checked 2026-10-14
41. 41
    Twilio charges a 75 USD fee per 911 call placed over Elastic SIP Trunking from a US number without a registered emergency address.

    SIP Trunking Pricing - United States · Emergency calling row · Checked 2026-10-14
42. 42
    Twilio Elastic SIP Trunking provides 1 termination call per second per trunk per region by default.

    Calls per Second (CPS) — Trunking Termination · Default CPS section · Checked 2026-10-14
43. 43
    Twilio's CPS documentation states that increasing CPS per region on Elastic SIP Trunking carries a prorated monthly fee.disputed

    Calls per Second (CPS) — Trunking Termination · Increasing CPS / billing paragraph · Checked 2026-10-14
44. 44
    Twilio's US Elastic SIP Trunking pricing page lists the CPS add-on as free for both pay-as-you-go and committed-use customers.disputed

    SIP Trunking Pricing - United States · CPS (calls per second) row · Checked 2026-10-14
45. 45
    To receive increased CPS on Twilio trunks traffic must average over 30 seconds per call with no more than 10 percent of calls at 12 seconds or less and an ASR above 70 percent.

    Calls per Second (CPS) — Trunking Termination · Traffic profile guidelines list · Checked 2026-10-14
46. 46
    Twilio lets customers set per-trunk termination CPS between 1 and 5 and directs requests above 5 to its sales team.

    Calls per Second (CPS) — Trunking Termination · Trunk Level CPS section · Checked 2026-10-14
47. 47
    Twilio publishes localized termination edges in Ashburn and Umatilla and Dublin and Frankfurt and Singapore and Tokyo and Sao Paulo and Sydney.

    Elastic SIP Trunking · Localized termination URIs / IP addresses section · Checked 2026-10-14
48. 48
    Twilio generates an electronic LOA for API port-ins and cancels the request if the authorized representative does not sign it within 30 days.

    Port phone numbers using Twilio APIs · Letter of Authorization / signature section · Checked 2026-10-14
49. 49
    A Twilio Elastic SIP trunk accepts up to ten Origination SIP URIs each with a priority and weight.

    Elastic SIP Trunking · Origination settings section · Checked 2026-10-14
50. 50
    Twilio's Porting API is in Public Beta with no SLA and sends no email notifications so status must be tracked by webhook.

    Port phone numbers using Twilio APIs · Public Beta notice · Checked 2026-10-14
51. 51
    Twilio's Porting API creates port-in requests for US non-toll-free numbers with up to 1000 numbers per request.

    Port phone numbers using Twilio APIs · Overview / supported numbers · Checked 2026-10-14
52. 52
    When Secure Trunking is enabled on a Twilio trunk any non-encrypted call is rejected.

    Elastic SIP Trunking · Secure Trunking section · Checked 2026-10-14
53. 53
    Twilio's Business and Personalized support plans guarantee a 1-hour 24/7 response for business-critical issues.

    Support Plans · Guaranteed response times table, business critical row · Checked 2026-10-14
54. 54
    Twilio's free Developer support plan has no guaranteed response times and gives an estimate of 3 business days.

    Support Plans · Guaranteed response times table, Developer column and footnote · Checked 2026-10-14
55. 55
    Twilio prices paid support as the greater of a monthly minimum or a share of spend: Production 250 USD or 4 percent and Business 1500 USD or 6 percent and Personalized 5000 USD or 8 percent.

    Support Plans · Plan pricing table · Checked 2026-10-14
56. 56
    Twilio's Production support plan guarantees responses within 3 business hours for business-critical and 6 for degraded-service and 9 for general issues.

    Support Plans · Guaranteed response times table, Production column · Checked 2026-10-14
57. 57
    Twilio's support plan terms exclude services provided by telecommunications providers along with alpha and beta and developer-preview products.

    Support Plans · Support plan terms, exclusions paragraph · Checked 2026-10-14
58. 58
    Twilio Elastic SIP Trunking termination requires E.164-formatted dialed digits and rejects other formats with a SIP 400 response.

    Elastic SIP Trunking · Termination Settings section · Checked 2026-10-14
59. 59
    Twilio Secure Trunking supports TLS 1.2 and above and no longer supports TLS 1.0 or 1.1.

    Elastic SIP Trunking · Secure Trunking section · Checked 2026-10-14

Documents

Cite this page

WarmTransfer. (2026, October 14). Wholesale SIP trunk providers compared. WarmTransfer. https://warmtransfer.net/knowledge/wholesale-sip-trunk-providers

@misc{warmtransfer-wholesale-sip-trunk-providers,
  title  = {Wholesale SIP trunk providers compared},
  author = {{WarmTransfer}},
  year   = {2026},
  url    = {https://warmtransfer.net/knowledge/wholesale-sip-trunk-providers},
  note   = {Verified 2026-10-14}
}