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Best O2 Business SIP Trunking Alternatives in 2026

Updated

20 apps from SIP trunking providers ranked against O2 Business SIP Trunking on the same published basis.

  1. 1
    Callcentric SIP Trunking Free plan AndroidextensioniOSLinuxMac Free6.7
    O2 Business SIP Trunking vs Callcentric SIP Trunking
  2. 2
    Twilio Segment Free plan WebiOSAndroid $120/mo6.5
    O2 Business SIP Trunking vs Twilio Segment
  3. 3
    Bandwidth Messaging API Free trial apiWeb 6.4
    O2 Business SIP Trunking vs Bandwidth Messaging API
  4. 4
    BulkVS SIP Trunking apiWeb $0.01/mo6.4
    O2 Business SIP Trunking vs BulkVS SIP Trunking
  5. 5
    Telnyx Text-to-Speech API Free plan apiWeb $500/mo6.4
    O2 Business SIP Trunking vs Telnyx Text-to-Speech API
  6. 6
    Anveo Direct api 6.3
    O2 Business SIP Trunking vs Anveo Direct
  7. 7
    Telnyx SIP Trunking Free plan apiWeb $500/mo6.3
    O2 Business SIP Trunking vs Telnyx SIP Trunking
  8. 8
    Sangoma Carrier Voice AndroidapiiOSWeb 5.6
    O2 Business SIP Trunking vs Sangoma Carrier Voice
  9. 9
    AT&T IP Flexible Reach Web 5.4
    O2 Business SIP Trunking vs AT&T IP Flexible Reach
  10. 10
    Callivex SIP Trunking apiWeb 5.4
    O2 Business SIP Trunking vs Callivex SIP Trunking
  11. 11
    IPComms SIP Trunking Free trial apiWeb 5.4
    O2 Business SIP Trunking vs IPComms SIP Trunking
  12. 12
    Sinch Fax API apiWeb 5.4
    O2 Business SIP Trunking vs Sinch Fax API
  13. 13
    Virgin Media Business SIP Trunking Web 5.4
    O2 Business SIP Trunking vs Virgin Media Business SIP Trunking
  14. 14
    BT Global SIP Web 5.3
    O2 Business SIP Trunking vs BT Global SIP
  15. 15
    Colt SIP Trunking Web 5.3
    O2 Business SIP Trunking vs Colt SIP Trunking
  16. 16
    Orange Business Talk IP apiWeb 5.3
    O2 Business SIP Trunking vs Orange Business Talk IP
  17. 17
    BICS SIP Trunking 5.2
    O2 Business SIP Trunking vs BICS SIP Trunking
  18. 18
    SIP.US Cloud SIP Trunking Free trial AndroidapiiOSWeb $1/mo5.2
    O2 Business SIP Trunking vs SIP.US Cloud SIP Trunking
  19. 19
    Gamma Horizon AndroidiOSWeb 5.1
    O2 Business SIP Trunking vs Gamma Horizon
  20. 20
    SendFax.to AndroidapiiOSWeb 5.1
    O2 Business SIP Trunking vs SendFax.to

O2 Business SIP Trunking alternatives compared

#AppScoreFree planFromRuns on
1Callcentric SIP Trunking6.7Free planFreeAndroid, Browser, iOS, Linux, Mac, self-hosted, Web, Windows
2Twilio Segment6.5Free plan$120/moWeb, iOS, Android
3Bandwidth Messaging API6.4API, Web
4BulkVS SIP Trunking6.4$0.01/moAPI, Web
5Telnyx Text-to-Speech API6.4Free plan$500/moAPI, Web
6Anveo Direct6.3API
7Telnyx SIP Trunking6.3Free plan$500/moAPI, Web
8Sangoma Carrier Voice5.6Android, API, iOS, Web
9AT&T IP Flexible Reach5.4Web
10Callivex SIP Trunking5.4API, Web
11IPComms SIP Trunking5.4API, Web
12Sinch Fax API5.4API, Web
13Virgin Media Business SIP Trunking5.4Web
14BT Global SIP5.3Web
15Colt SIP Trunking5.3Web
16Orange Business Talk IP5.3API, Web
17BICS SIP Trunking5.2
18SIP.US Cloud SIP Trunking5.2No$1/moAndroid, API, iOS, Web
19Gamma Horizon5.1Android, iOS, Web
20SendFax.to5.1NoAndroid, API, iOS, Web
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Questions about O2 Business SIP Trunking alternatives

What is the best alternative to O2 Business SIP Trunking?

Callcentric SIP Trunking, number 1 in SIP trunking providers with a score of 6.7 out of 10. The others here: Twilio Segment, Bandwidth Messaging API, BulkVS SIP Trunking and 16 more.

What is the best free alternative to O2 Business SIP Trunking?

Callcentric SIP Trunking is the best-ranked alternative with a free plan. 4 of the 20 alternatives here publish a free plan on their own pricing pages.

How are these alternatives ranked?

Ranked free-and-open first: a usable free tier and open-source code, then the platforms it runs on and its documentation.