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3CX SIP Trunk Providers – UK

These UK SIP Trunk Providers have been tested and certified by 3CX. With no manual configuration required you can just plug and play your PBX with a SIP Trunk of your choice. Preferred SIP Trunk providers are tested against each build of 3CX. Both parties are committed to providing end-to-end support to the UK customers who choose to use the combination of 3CX with a preferred SIP Trunk.

Preferred Providers

UK SIP Trunk Provider Gradwell
Provider Gradwell
Support Cooperation Yes
Provider Type IP Based (Static Public IP Required)
Fax Support Not working
SI Mode DID Inbound Only
Clip No Screening Support No
Anonymous Calling No
DTMF Support (RFC2833) Yes
IPV6 Ready No
Online Sign-Up Possible? No
Online Trunk-Management Portal? Yes
Link to Support Document View
302 Diversion Support No
Included in Auto-Testing  No
Spitfire UK VoIP Providers
Provider Spitfire
Support Cooperation Yes
Provider Type Register Based
Fax Support Not Working
SI Mode Yes – Automata
Clip No Screening Support No
Anonymous Calling Yes
DTMF Support (RFC2833) Yes
IPV6 Ready No
Online Sign-Up Possible? Yes
Online Trunk-Management Portal? Yes
Link to Support Document View
302 Diversion Support No
Included in Auto-Testing No
TalkTalk UK VoIP Provider
Provider TalkTalk Business
Support Cooperation Yes
Provider Type IP Based (Static Public IP Required)
Fax Support Audio
SI Mode Yes – Static (Single Account Support)
Clip No Screening Support Yes
Anonymous Calling Yes
DTMF Support (RFC2833) Yes
IPV6 Ready No
Online Sign-Up Possible? Yes
Online Trunk-Management Portal? Yes
Link to Support Document View
302 Diversion Support No
Included in Auto-Testing No

Supported Providers

UK SIP TrunK Provider BT
Provider BT SIP-T Trunk
Support Cooperation Yes
Provider Type Register Based
Fax Support Not Working
SI Mode Yes – Static (Single Account Support)
Clip No Screening Support No
Anonymous Calling Yes
DTMF Support (RFC2833) Yes
IPV6 Ready No
Online Sign-Up Possible? No
Online Trunk-Management Portal? Yes
Link to Support Document View
302 Diversion Support Yes
Included in Auto-Testing  No
US BT Wholesale as your UK SIP Trunk Provider with 3CX Phone System
Provider BT WSIPT
Support Cooperation Yes
Provider Type IP Based (Static Public IP Required)
Fax Support T38 Upscale
SI Mode DID – Inbound Only
Clip No Screening Support Yes
Anonymous Calling Yes
DTMF Support (RFC2833) Yes
IPV6 Ready No
Online Sign-Up Possible? No
Online Trunk-Management Portal? No
Link to Support Document View
302 Diversion Support No
Included in Auto-Testing  No
Brightstar UK VoIP Provider
Provider Brightstar
Support Cooperation Yes
Provider Type Register Based
Fax Support Not Working
SI Mode Yes – Automata
Clip No Screening Support Yes
Anonymous Calling Yes
DTMF Support (RFC2833) Yes
IPV6 Ready No
Online Sign-Up Possible? No
Online Trunk-Management Portal? No
Link to Support Document N/A
302 Diversion Support No
Included in Auto-Testing  No
Gamma UK VoIP Provider
Provider Gamma
Support Cooperation Yes
Provider Type IP Based (Static Public IP Required)
Fax Support T38 Bypass
SI Mode Yes – Static (Single Account Support)
Clip No Screening Support Yes (separate service)
Anonymous Calling Yes
DTMF Support (RFC2833) Yes
IPV6 Ready No
Online Sign-Up Possible? No
Online Trunk-Management Portal? No
Link to Support Document N/A
302 Diversion Support No
Included in Auto-Testing  No
IT Communications UK VoIP Provider
Provider I.T Communications
Support Cooperation Yes
Provider Type Register Based
Fax Support T38 Bypass
SI Mode DID Inbound Only
Clip No Screening Support No
Anonymous Calling No
DTMF Support (RFC2833) Yes
IPV6 Ready No
Online Sign-Up Possible? No
Online Trunk-Management Portal? Yes
Link to Support Document View
302 Diversion Support Yes
Included in Auto-Testing  No
Orbtalk SIP Trunk Provider - UK
Provider Orbtalk
Support Cooperation Yes
Provider Type Register Based
Fax Support Not Working
SI Mode Yes – Automata
Clip No Screening Support No
Anonymous Calling Yes
DTMF Support (RFC2833) Yes
IPV6 Ready No
Online Sign-Up Possible? Yes
Online Trunk-Management Portal? Yes
Link to Support Document View
302 Diversion Support Yes
Included in Auto-Testing  No
T4Com UK VoIP Provider
Provider T4Com
Support Cooperation Yes
Provider Type Register Based
Fax Support Not Working
SI Mode Yes – Automata
Clip No Screening Support Yes
Anonymous Calling Yes
DTMF Support (RFC2833) Yes
IPV6 Ready No
Online Sign-Up Possible? No
Online Trunk-Management Portal? No
Link to Support Document N/A
302 Diversion Support No
Included in Auto-Testing  No
Voiceflex UK VoIP provider
Provider Voiceflex
Support Cooperation Yes
Provider Type Register Based
Fax Support T38 Bypass
SI Mode Yes – Static (Single Account Support)
Clip No Screening Support Yes
Anonymous Calling Yes
DTMF Support (RFC2833) Yes
IPV6 Ready No
Online Sign-Up Possible? No
Online Trunk-Management Portal? Yes
Link to Support Document View
302 Diversion Support No
Included in Auto-Testing  No
Zen Business Talk SIP UK VoIP Provider
Provider Zen Business Talk SIP
Support Cooperation Yes
Provider Type Register Based
Fax Support Audio
SI Mode Yes – Static (Single Account Support)
Clip No Screening Support No
Anonymous Calling No
DTMF Support (RFC2833) Yes
IPV6 Ready No
Online Sign-Up Possible? No
Online Trunk-Management Portal? No
Link to Support Document View
302 Diversion Support No
Included in Auto-Testing  No