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Best O2 Business SIP Trunking Alternatives in 2026

Updated

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

  1. 1
    Twilio Segment Free plan WebiOSAndroid $120/mo7.6
    O2 Business SIP Trunking vs Twilio Segment
  2. 2
    Callcentric SIP Trunking Free plan AndroidextensioniOSLinuxMac Free7.5
    O2 Business SIP Trunking vs Callcentric SIP Trunking
  3. 3
    Bandwidth Messaging API Free trial apiWeb 7.4
    O2 Business SIP Trunking vs Bandwidth Messaging API
  4. 4
    SIP.US Cloud SIP Trunking Free trial AndroidapiiOSWeb $1/mo7.2
    O2 Business SIP Trunking vs SIP.US Cloud SIP Trunking
  5. 5
    BulkVS SIP Trunking apiWeb $0.01/mo7.0
    O2 Business SIP Trunking vs BulkVS SIP Trunking
  6. 6
    Sangoma Carrier Voice AndroidapiiOSWeb 6.9
    O2 Business SIP Trunking vs Sangoma Carrier Voice
  7. 7
    Telnyx Text-to-Speech API Free plan apiWeb $500/mo6.9
    O2 Business SIP Trunking vs Telnyx Text-to-Speech API
  8. 8
    Anveo Direct api 6.7
    O2 Business SIP Trunking vs Anveo Direct
  9. 9
    IPComms SIP Trunking Free trial apiWeb 6.7
    O2 Business SIP Trunking vs IPComms SIP Trunking
  10. 10
    SendFax.to AndroidapiiOSWeb 6.7
    O2 Business SIP Trunking vs SendFax.to
  11. 11
    Telnyx SIP Trunking Free plan apiWeb $500/mo6.7
    O2 Business SIP Trunking vs Telnyx SIP Trunking
  12. 12
    Gamma Horizon AndroidiOSWeb 6.6
    O2 Business SIP Trunking vs Gamma Horizon
  13. 13
    Sinch Fax API apiWeb 6.5
    O2 Business SIP Trunking vs Sinch Fax API
  14. 14
    VoIP.ms SIP Trunking AndroidiOS $23/mo6.4
    O2 Business SIP Trunking vs VoIP.ms SIP Trunking
  15. 15
    AT&T IP Flexible Reach Web 6.3
    O2 Business SIP Trunking vs AT&T IP Flexible Reach
  16. 16
    BT Global SIP Web 6.3
    O2 Business SIP Trunking vs BT Global SIP
  17. 17
    Callivex SIP Trunking apiWeb 6.3
    O2 Business SIP Trunking vs Callivex SIP Trunking
  18. 18
    Colt SIP Trunking Web 6.3
    O2 Business SIP Trunking vs Colt SIP Trunking
  19. 19
    Dollu CCaaS apiWeb 6.3
    O2 Business SIP Trunking vs Dollu CCaaS
  20. 20
    Virgin Media Business SIP Trunking Web 6.3
    O2 Business SIP Trunking vs Virgin Media Business SIP Trunking

O2 Business SIP Trunking alternatives compared

#ToolScoreFree planFromRuns on
1Twilio Segment7.6Free plan$120/moWeb, iOS, Android
2Callcentric SIP Trunking7.5Free planFreeAndroid, Browser, iOS, Linux, Mac, self-hosted, Web, Windows
3Bandwidth Messaging API7.4API, Web
4SIP.US Cloud SIP Trunking7.2No$1/moAndroid, API, iOS, Web
5BulkVS SIP Trunking7.0$0.01/moAPI, Web
6Sangoma Carrier Voice6.9Android, API, iOS, Web
7Telnyx Text-to-Speech API6.9Free plan$500/moAPI, Web
8Anveo Direct6.7API
9IPComms SIP Trunking6.7API, Web
10SendFax.to6.7NoAndroid, API, iOS, Web
11Telnyx SIP Trunking6.7Free plan$500/moAPI, Web
12Gamma Horizon6.6Android, iOS, Web
13Sinch Fax API6.5API, Web
14VoIP.ms SIP Trunking6.4No$23/moAndroid, iOS
15AT&T IP Flexible Reach6.3Web
16BT Global SIP6.3Web
17Callivex SIP Trunking6.3API, Web
18Colt SIP Trunking6.3Web
19Dollu CCaaS6.3API, Web
20Virgin Media Business SIP Trunking6.3Web
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Questions about O2 Business SIP Trunking alternatives

What is the best alternative to O2 Business SIP Trunking?

Twilio Segment, number 1 in SIP trunking providers with a score of 7.6 out of 10. The others here: Callcentric SIP Trunking, Bandwidth Messaging API, SIP.US Cloud SIP Trunking and 16 more.

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

Twilio Segment 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 on what each maker publishes, the fullest spec sheet first: how deeply the product is documented, the platforms it runs on, a free tier or trial to test it, and its standing.