Troubleshooting toll-free numbers that fail from some carriers

See also

Sources

1. 1
   A toll-free number may remain in Assigned status for up to six months before it must convert to Working status.

   47 CFR § 52.103 - Lag times · 47 CFR 52.103, lag times for Assigned status · Checked 2026-10-02
2. 2
   Amazon Connect does not support using toll-free numbers for outbound international calling, citing spam flagging by downstream providers and unexpected fees for recipients.

   Outbound calling restrictions in Connect Customer · section 'Use of toll-free numbers outside the country of origin' · Checked 2026-10-02
3. 3
   Amazon Connect warns that using a toll-free number as caller ID to dial other US toll-free numbers can lead carriers to filter, block or misroute the call, and says to use DIDs to guarantee delivery.

   Set up outbound caller ID in Connect Customer · section 'Toll-free numbers for caller ID' · Checked 2026-10-02
4. 4
   FCC rules prohibit acquiring a toll-free number in order to sell it to another entity for a fee.

   47 CFR Part 52 Subpart D - Toll Free Numbers (annual edition) · 47 CFR 52.107(a)(2) · Checked 2026-10-02
5. 5
   When a toll-free port-in order is submitted, Bandwidth fetches the number's status and controlling RespOrg from Somos to check portability.

   Toll-free port-in API changes · section on SOMOS data fetching · Checked 2026-10-02
6. 6
   A Bandwidth toll-free port-in order moves to the INVALID_TFNS state if any number is not portable or the numbers are controlled by different RespOrgs.

   Toll-free port-in API changes · section on order states and non-portable numbers · Checked 2026-10-02
7. 7
   Bandwidth requires an uploaded LOA before a toll-free port-in order can be submitted, because it sends the RespOrg change request to Somos.

   Toll-free port-in API changes · section on LOA requirement · Checked 2026-10-02
8. 8
   After the LOA is accepted, Bandwidth immediately sends the RespOrg change to Somos if one is needed.

   Toll-free port-in API changes · section on routing/activation · Checked 2026-10-02
9. 9
   Flowroute states that the RespOrg specifies which carrier handles a toll-free call, usually based on the caller's geographic codes such as LATA or NPA-NXX.

   Calling From Toll-free Numbers · section on RespOrg routing · Checked 2026-10-02
10. 10
    A toll-free number stays in Disconnect status for at least 45 days and at most four months, with no extensions.

    47 CFR § 52.103 - Lag times · 47 CFR 52.103, lag times for Disconnect status · Checked 2026-10-02
11. 11
    An intercept recording heard from every carrier fits a number in Disconnect status, which is a database state of the number, whereas failure from only some carriers fits origin-specific routing.inferred

    47 CFR § 52.103 - Lag times · 47 CFR 52.103(a) Disconnect definition (basis for inference) · Checked 2026-10-02
12. 12
    Flowroute states that international calls to US toll-free numbers often fail because RespOrgs avoid the higher cost of routing calls from origins without a valid LATA or NPA-NXX.

    Calling From Toll-free Numbers · section on international origination · Checked 2026-10-02
13. 13
    Amazon Connect states that toll-free numbers are national products and international reachability is not guaranteed, because access is controlled by the caller's network.

    Set up outbound caller ID in Connect Customer · section 'Toll-free numbers for caller ID', Important note · Checked 2026-10-02
14. 14
    A toll-free port is a RespOrg change in the SMS database rather than a local number port, so NPAC subscription-version checks used for geographic numbers do not show whether a toll-free cutover is complete.inferred

    Toll Free Assignment Modernization; Text-Enabled Toll Free Numbers, Declaratory Ruling and Notice of Proposed Rulemaking (FCC 18-77) · FCC 18-77 paragraph 6 (basis for inference) · Checked 2026-10-02
15. 15
    Flowroute says a toll-free call rejected for lack of a routing path may play a message such as 'This destination is not available from your calling area.'

    Calling From Toll-free Numbers · section on error messaging · Checked 2026-10-02
16. 16
    Because every originating carrier resolves a toll-free number with its own database query and gets a carrier back, failure from one carrier while others succeed most likely lies in the routing returned for that carrier's callers or in that carrier's handling of the query, not in the destination PBX or contact centre.inferred

    8YY Access Charge Reform, Report and Order (FCC 20-143) · FCC 20-143 paragraphs 7-8 (basis for inference) · Checked 2026-10-02
17. 17
    Somos describes operating an SCP as giving a network operator a local copy of toll-free routing data, avoiding query latency but requiring substantial capital investment.

    Modernizing Access to Toll-Free Routing Information for Network Operators · section 'Current Distribution Methods', Service Control Points · Checked 2026-10-02
18. 18
    For an 8YY call the originating carrier does not simply hand the call to the caller's presubscribed long-distance carrier; it queries the industry 8YY database run by the TFNA to find the 8YY provider for the dialled number.

    8YY Access Charge Reform, Report and Order (FCC 20-143) · FCC 20-143 paragraph 7 · Checked 2026-10-02
19. 19
    IXICA states that its Canadian or US toll-free numbers are reachable from anywhere in North America unless the number's owner has defined a geographic limitation.

    Can anyone from anywhere call my Toll Free number? · FAQ 'Can anyone from anywhere call my Toll Free number?' · Checked 2026-10-02
20. 20
    Flowroute recommends sending a valid billing telephone number in a P-Charge-Info SIP header on the INVITE to improve completion of calls placed from toll-free numbers.

    Calling From Toll-free Numbers · section on recommended workaround · Checked 2026-10-02
21. 21
    A toll-free subscriber ports its number by asking its current RespOrg to change the RespOrg in the SMS database to another RespOrg.

    Toll Free Assignment Modernization; Text-Enabled Toll Free Numbers, Declaratory Ruling and Notice of Proposed Rulemaking (FCC 18-77) · FCC 18-77 paragraph 6 · Checked 2026-10-02
22. 22
    After a RespOrg change, calls complete only once the new RespOrg's routing record is in Working status in the SCPs, so a post-port outage on all carriers points first to the new RespOrg's record rather than to the losing carrier.inferred

    47 CFR § 52.103 - Lag times · 47 CFR 52.103(a) Working and Assigned definitions (basis for inference) · Checked 2026-10-02
23. 23
    An 8YY database query returns a carrier identification code that tells the local exchange carrier which 8YY provider to route the call to.

    8YY Access Charge Reform, Report and Order (FCC 20-143) · FCC 20-143 paragraph 8 · Checked 2026-10-02
24. 24
    A toll-free number may stay in Reserved status for at most 45 days with no extensions, except for numbers assigned by competitive bidding.

    47 CFR § 52.103 - Lag times · 47 CFR 52.103, lag times for Reserved status · Checked 2026-10-02
25. 25
    Once a toll-free number is reserved, the RespOrg is responsible for creating the subscriber's toll-free record in the SMS database.

    Toll Free Assignment Modernization; Text-Enabled Toll Free Numbers, Declaratory Ruling and Notice of Proposed Rulemaking (FCC 18-77) · FCC 18-77 paragraph 6 · Checked 2026-10-02
26. 26
    Under FCC rules a Responsible Organization (RespOrg) is the entity a toll-free subscriber chooses to manage and administer that subscriber's records in the toll-free Service Management System.

    47 CFR § 52.101 - General definitions · 47 CFR 52.101(b) · Checked 2026-10-02
27. 27
    Somos authorises network operators through RouteLink to download and use the toll-free Routing Database for routing toll-free calls, with near real-time updates from the TFN Registry.

    Access Toll-Free Routing Data with RouteLink · RouteLink page, customer types and data description · Checked 2026-10-02
28. 28
    The Somos routing data distributed to network operators includes the identity of the RespOrg for each toll-free number and its call processing records.

    Access Toll-Free Routing Data with RouteLink · RouteLink page, network operator section · Checked 2026-10-02
29. 29
    The 8YY database query goes to a Service Control Point, a regional database holding routing instructions for toll-free numbers in particular geographic areas.

    8YY Access Charge Reform, Report and Order (FCC 20-143) · FCC 20-143 paragraph 7 · Checked 2026-10-02
30. 30
    FCC rules define Service Control Points as the regional databases in the toll-free network.

    47 CFR § 52.101 - General definitions · 47 CFR 52.101(c) · Checked 2026-10-02
31. 31
    Flowroute says a failed toll-free call may also simply drop with no operator recording.

    Calling From Toll-free Numbers · section on error messaging · Checked 2026-10-02
32. 32
    The SMS Database is the administrative database system for toll-free numbers through which RespOrgs enter and amend the data about toll-free numbers they control.

    47 CFR § 52.101 - General definitions · 47 CFR 52.101(d) · Checked 2026-10-02
33. 33
    Bandwidth describes the Somos database as telling the world where to route a call when someone dials a toll-free number, with RespOrgs managing the routing templates in it.

    What is a Responsible Organization (RespOrg)? Toll-Free Number Management · section on acting as your own RespOrg · Checked 2026-10-02
34. 34
    Somos publishes a help desk reachable by phone or text at 844-HEY-SOMOS and by email at help@somos.com.

    Find a Toll-Free Number · page contact section · Checked 2026-10-02
35. 35
    Somos, as the Toll Free Numbering Administrator, is the carrier of record for the toll-free Service Management System and established a tariff for it.

    Toll Free Assignment Modernization; Text-Enabled Toll Free Numbers, Declaratory Ruling and Notice of Proposed Rulemaking (FCC 18-77) · FCC 18-77 paragraph 4 · Checked 2026-10-02
36. 36
    A toll-free number in Assigned status has subscriber routing information entered by the RespOrg but is still pending activation.

    47 CFR § 52.103 - Lag times · 47 CFR 52.103(a), Assigned · Checked 2026-10-02
37. 37
    A toll-free number in Disconnect status has been discontinued and an exchange carrier intercept recording is being provided.

    47 CFR § 52.103 - Lag times · 47 CFR 52.103(a), Disconnect · Checked 2026-10-02
38. 38
    Transitional status covers a toll-free number disconnected for less than four months for which no intercept recording is being provided.

    47 CFR § 52.103 - Lag times · 47 CFR 52.103(a), Transitional · Checked 2026-10-02
39. 39
    A toll-free number in Working status is loaded in the Service Control Points and is being used.

    47 CFR § 52.103 - Lag times · 47 CFR 52.103(a), Working · Checked 2026-10-02
40. 40
    A toll-free number may be held in Suspend status for at most eight months, and only for billing disputes.

    47 CFR § 52.103 - Lag times · 47 CFR 52.103, lag times for Suspend status · Checked 2026-10-02
41. 41
    Telnyx requires the LOA signature for a port to be dated within the last 90 days.

    Porting Requirements · LOA requirements · Checked 2026-10-02
42. 42
    Telnyx requires toll-free port LOAs to include the text 'Port to RespOrg QIT02'.

    Porting Requirements · toll-free LOA requirement · Checked 2026-10-02
43. 43
    Telnyx states that a standard RespOrg transfer takes 3 to 7 business days to process.

    Porting Requirements · toll-free timing statement · Checked 2026-10-02
44. 44
    Because toll-free routing can differ by the caller's LATA or NPA-NXX and by originating carrier, a useful test plan places calls from several carriers, both wireline and wireless, and from several areas, recording the calling number of each attempt.inferred

    Calling From Toll-free Numbers · section on RespOrg routing (basis for inference) · Checked 2026-10-02
45. 45
    Flowroute states that calls placed with a toll-free number as caller ID to another toll-free number are likely to fail because the toll-free caller has no defined location for billing or routing.

    Calling From Toll-free Numbers · section on why toll-free to toll-free calls fail · Checked 2026-10-02
46. 46
    US toll-free numbers use the prefixes 800, 888, 877, 866, 855, 844 and 833, and the same digits under a different prefix are a different number.

    What is a Responsible Organization (RespOrg)? Toll-Free Number Management · section on prefixes · Checked 2026-10-02
47. 47
    The Toll Free Numbering Administrator (TFNA) is the FCC-appointed entity that provides user support for the SMS database and administers it day to day.

    47 CFR § 52.101 - General definitions · 47 CFR 52.101(a) · Checked 2026-10-02
48. 48
    If the current RespOrg refuses to make the RespOrg change, the subscriber can ask the TFNA Help Desk to make the change instead.

    Toll Free Assignment Modernization; Text-Enabled Toll Free Numbers, Declaratory Ruling and Notice of Proposed Rulemaking (FCC 18-77) · FCC 18-77 paragraph 6 · Checked 2026-10-02
49. 49
    In 2016 Somos stated that most network operators resolved toll-free numbers through third-party query services, which requires leaving their own network for each query and adds call setup latency.

    Modernizing Access to Toll-Free Routing Information for Network Operators · section 'Current Distribution Methods' · Checked 2026-10-02
50. 50
    Amazon Connect documents per-country UIFN reachability that is limited to named networks in some countries, for example only BT, Vodafone and EE in the United Kingdom, and not MTN or prepaid subscribers in South Africa.

    Connect Customer support of the inbound only UIFN service · section 'Countries that support UIFNs', United Kingdom and South Africa rows · Checked 2026-10-02
51. 51
    A Universal International Freephone Number is inbound-only and consists of the 3-digit code 800 plus an 8-digit Global Subscriber Number, 11 digits in total.

    Connect Customer support of the inbound only UIFN service · introductory section · Checked 2026-10-02
52. 52
    Amazon Connect does not support calling a UIFN from Connect itself in loopback mode; UIFNs must be tested from phones on the country's public network.

    Connect Customer support of the inbound only UIFN service · introductory section, loopback paragraph · Checked 2026-10-02
53. 53
    Amazon Connect notes that in recent years smaller carriers increasingly do not support UIFN.

    Connect Customer support of the inbound only UIFN service · introductory section · Checked 2026-10-02
54. 54
    RespOrgs may not reserve toll-free numbers without an actual toll-free subscriber, and a reservation serves as the RespOrg's certification that an identified subscriber exists.

    47 CFR Part 52 Subpart D - Toll Free Numbers (annual edition) · 47 CFR 52.105(a), (b) and (d) · Checked 2026-10-02

Documents

Cite this page

WarmTransfer. (2026, October 2). Troubleshooting toll-free numbers that fail from some carriers. WarmTransfer. https://warmtransfer.net/knowledge/toll-free-routing-troubleshooting

@misc{warmtransfer-toll-free-routing-troubleshooting,
  title  = {Troubleshooting toll-free numbers that fail from some carriers},
  author = {{WarmTransfer}},
  year   = {2026},
  url    = {https://warmtransfer.net/knowledge/toll-free-routing-troubleshooting},
  note   = {Verified 2026-10-02}
}