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3CX SIP Trunk Providers – USA

These USA 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 USA customers who choose to use the combination of 3CX with a preferred SIP Trunk.

Preferred Providers

Callcentric USA VoIP Provider
Provider Callcentric
Support Cooperation No
Provider Type Register Based
Fax Support T38 Bypass
SI Mode Yes – Automata
Clip No Screening Support No
Anonymous Calling No
DTMF Support (RFC2833) Yes
IPV6 Ready No
Online Sign-Up Possible? Yes
Online Trunk-Management Portal? Yes
Link to Support Document N/A
302 Diversion Support
Included in Auto-Testing No
didlogic VoIP Provider
Provider DID Logic
Support Cooperation Yes
Provider Type Register Based
Fax Support T38 Bypass
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 N/A
302 Diversion Support No
Included in Auto-Testing  No
Flowroute USA VoIP Provider
Provider Flowroute
Support Cooperation Yes
Provider Type Register Based
Fax Support T38 Bypass
SI Mode Yes – Static (Multi 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 Yes
Included in Auto-Testing  No
Nexmo USA SIP Trunk Provider
Provider Nexmo
Support Cooperation Yes
Provider Type Register Based
Fax Support Audio
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? Yes
Online Trunk-Management Portal? Yes
Link to Support Document View
302 Diversion Support No
Included in Auto-Testing  No
Provider NTS Direct
Support Cooperation Yes
Provider Type Register Based
Fax Support T38 Bypass
SI Mode Yes – Automata
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 N/A
302 Diversion Support No
Included in Auto-Testing  No
TechSitters USA VoIP Provider
Provider TechSitters
Support Cooperation Yes
Provider Type Register Based
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? No
Online Trunk-Management Portal? No
Link to Support Document N/A
302 Diversion Support No
Included in Auto-Testing  No
Voxtelesys US SIP Trunk
Provider Voxtelesys
Support Cooperation Yes
Provider Type Register Based
Fax Support Not Working
SI Mode Yes – Automata
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 Yes

Supported Providers

Bandwidth USA VoIP Provider
Provider Bandwidth
Support Cooperation No
Provider Type IP Based (Static Public IP Required)
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? Yes
Online Trunk-Management Portal? Yes
Link to Support Document N/A
302 Diversion Support No
Included in Auto-Testing  No
Broadvoice USA VoIP Provider
Provider Broadvoice
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 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 N/A
302 Diversion Support
Included in Auto-Testing  No
CenturyLink US VoIP Provider
Provider CenturyLink
Support Cooperation Yes
Provider Type Register Based
Fax Support T38 Upscale
SI Mode Yes – Automata
Clip No Screening Support Yes
Anonymous Calling Yes
DTMF Support (RFC2833) Yes
IPV6 Ready Yes
Online Sign-Up Possible? Yes
Online Trunk-Management Portal? No
Link to Support Document View
302 Diversion Support
Included in Auto-Testing  No
Cobalt IT - US SIP Trunk Provider
Provider Cobalt IT
Support Cooperation Yes
Provider Type Register Based
Fax Support T38 Bypass
SI Mode Yes – Static (Multi 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? No
Link to Support Document View
302 Diversion Support Yes
Included in Auto-Testing  Yes
Fusion US VoIP Provider
Provider Fusion
Support Cooperation Yes
Provider Type Register Based
Fax Support T38 Bypass
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 N/A
302 Diversion Support No
Included in Auto-Testing  No
Ironton US VoIP Provider
Provider Ironton Global
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
SIPTRUNK.com USA VoIP Provider
Provider SIPTRUNK.com
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? Yes
Link to Support Document View
302 Diversion Support No
Included in Auto-Testing  No
SIP.US USA VoIP Provider
Provider SIP.US
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? Yes
Online Trunk-Management Portal? Yes
Link to Support Document View
302 Diversion Support No
Included in Auto-Testing  No
Telnyx VoIP Provider
Provider Telnyx
Support Cooperation Yes
Provider Type Register Based
Fax Support T38 Bypass
SI Mode Yes – Automata
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 N/A
302 Diversion Support
Included in Auto-Testing  No
Vitelity US VoIP Provider
Provider Vitelity
Support Cooperation Yes
Provider Type IP Based (Static Public IP Required)
Fax Support Not Working
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? Yes
Link to Support Document View
302 Diversion Support
Included in Auto-Testing  No
USA SIP Trunk Provider Wiretap Telecom has passed the 3CX interop test
Provider Wiretap Telecom
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
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

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