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Best SIP Trunking Providers in 2026

SIP trunking providers connect voice systems to telephone networks, and the listed comparison fields cover capacity, calling features, and pricing. Compare concurrent channels with emergency calling, toll-free numbers, and number porting; encrypted signaling and the pricing model offer additional distinctions. Free-plan availability and paid-from pricing are also included. The ranked entries start with Callcentric SIP Trunking, Twilio Segment, and Telnyx Text-to-Speech API. Weigh the stated capabilities against the calling and pricing requirements you have.

  1. 1

    Callcentric SIP Trunking

    Free plan AndroidExtensioniPhone+5

    Callcentric offers pay-per-minute SIP trunking with three included channels and international business-number availability.

    7.5 Free plan Visit site
  2. 2

    IPComms SIP Trunking

    Free plan APIWeb

    IPComms offers usage-billed SIP trunking with a free plan, no trunk or channel fee, and a list of PBX and contact-center connections.

    6.9 Free plan · paid from $1.50/mo Visit site
  3. 3

    Flowroute

    Free trial AndroidAPIiPhone+1

    Flowroute combines telephony infrastructure, APIs, number management, routing, and fraud controls for communications operations.

    6.2 Visit site
  4. 4

    SIP.US Cloud SIP Trunking

    Free trial AndroidAPIiPhone+1

    SIP.US provides cloud trunking for existing PBX systems, with channel-based calling, call records, and failover options.

    6.0 Visit site
  5. 5

    Telnyx SIP Trunking

    Free trial AndroidAPIiPhone+1

    Telnyx combines SIP connectivity with calling safeguards, a range of integrations, and usage-based calling rates.

    5.9 Visit site
  6. 6

    Anveo Direct

    Paid APIWeb

    Anveo Direct combines call termination, SIP trunking, routing controls, and geographic DIDs. Confirm the authentication, SIP URI, traffic, support, and pricing details fit your use case.

    5.8 From $0.15/mo Visit site
  7. 7

    AT&T IP Flexible Reach

    Paid Web

    IP Flexible Reach connects existing telephony equipment to SIP calling, with options for Teams integration and shared branch trunks.

    5.6 Pricing on request Visit site
  8. 8

    AVOXI Global SIP Trunking

    Paid Web

    AVOXI combines international SIP calling with number management, routing analytics, and listed security measures.

    5.6 Pricing on request Visit site
  9. 9

    BulkVS SIP Trunking

    Paid APIWeb

    BulkVS SIP Trunking offers usage-based inbound and outbound voice service with broad listed switch compatibility.

    5.6 From $0.06/mo Visit site
  10. 10

    Callivex SIP Trunking

    Paid APIWeb

    Callivex offers bidirectional SIP trunks with granular per-second billing, multiple authentication options, and listed fraud controls.

    5.6 Pricing on request Visit site
  11. 11

    BT Global SIP

    Paid Web

    BT Global SIP offers country-dependent voice connectivity, calling features, and a real-time management portal.

    5.5 Pricing on request Visit site
  12. 12

    DIDWW Two-way SIP Trunking

    Paid APIWeb

    DIDWW combines local and international SIP termination with security options, integrations and API controls.

    5.5 Visit site
  13. 13

    Sangoma Carrier Voice

    Paid AndroidAPIiPhone+1

    Sangoma Carrier Voice covers wholesale communications, billing, and emergency calling through its portal and APIs.

    5.5 Pricing on request Visit site
  14. 14

    Colt SIP Trunking

    Paid Web

    Colt SIP Trunking combines IP PBX calling with listed integrations, encryption and number-management options. Pricing is not published, and Colt directs prospective customers to contact its team.

    5.3 Pricing on request Visit site
  15. 15

    Gradwell SIP Trunking

    Paid Web

    Gradwell SIP Trunking links existing business phone systems with the traditional network, including dedicated options for 3CX, Teams, and contact centres.

    5.2 From £4/mo Visit site
  16. 16

    Orange Business Talk IP

    Paid APIWeb

    Choose Orange Business Talk IP if your organization needs a multi-site voice service for its own telephony and collaboration equipment, with continuity options and portal or API administration.

    5.2 Pricing on request Visit site
  17. 17

    Frontier SIP Trunking

    Paid

    Frontier SIP Trunking extends existing phone systems with scalable call paths, continuity tools, and managed deployment support.

    5.1 Pricing on request Visit site
  18. 18

    O2 Business SIP Trunking

    Paid Web

    O2 Business SIP Trunking is for organisations keeping a PBX while moving to SIP connectivity. Listed pricing includes £4.50 a month for a standard channel, with underlying SIP access excluded.

    5.1 Visit site
  19. 19

    Skyetel SIP Trunking

    Paid APIWeb

    Skyetel provides internet-based SIP trunking with scalable channels, numbering options, security controls, and business telephony APIs.

    5.1 From $25/mo Visit site
  20. 20

    VoIP.ms SIP Trunking

    Paid AndroidiPhone

    VoIP.ms SIP Trunking provides configurable inbound and outbound connectivity for existing SIP systems, with encryption, monitoring, and failover controls.

    5.0 Pricing on request Visit site
  21. 21

    Virgin Media Business SIP Trunking

    Paid Web

    Consider SIP Trunking if your business wants to keep its existing phone system and manage calls over an IP connection.

    4.9 Pricing on request Visit site
  22. 22

    BICS SIP Trunking

    Paid

    BICS SIP Trunking provides core telephony features including porting, emergency access, toll-free numbers, and encrypted signaling.

    4.8 Pricing on request Visit site
  23. 23

    ClearlyIP SIP Trunking

    Paid Web
    4.8 From $17.99/mo Visit site
  24. 24

    Bandwidth Global SIP Trunking

    Paid Web
    4.7 Pricing on request Visit site
  25. 25

    Dollu SIP Trunking

    Paid Web
    4.4 Pricing on request Visit site

#1Places #1, #2, #3, #4, #5 on this list can be bought by the makers of the software on it. See the price

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