PROVEN 3CX COMPATIBILITY
3CX-compatible UK SIP trunks.
Connect 3CX using a registered Sipflex trunk, pilot-number authentication and automatic DDI delivery.
- Registration-based trunk
- Pilot number and DDIs
- Concurrent-call control
- Caller ID and P-Asserted-Identity
- TLS transport option
HOW IT CONNECTS
One registration. All your numbers.
Register the trunk using its pilot number. Other numbers on the account are delivered as DDIs through the same 3CX trunk, including numbers added later.
- Generic SIP Trunk template
- Account-based authentication
- Selectable concurrent-call capacity
- DDI and outbound caller-ID configuration
Versioned configuration guide
Follow the Sipflex portal and 3CX steps for registration, codecs, caller-ID presentation, TLS and network allow-listing.
Configure 3CXNetwork allow-list
When configuring the 3CX allow-list, use the current Sipflex network address:
52.56.188.70/32
PROVIDER STATUS
Compatible today. Listing still to come.
Sipflex is technically compatible with 3CX but is not currently listed as an officially supported provider under the Sipflex brand. Select “Generic SIP Trunk” during setup.
The underlying technology is also used by white-label providers that have completed the 3CX interoperability process. Their listing does not transfer to Sipflex, so we describe the status directly.
30-DAY FREE TRIAL
Connect 3CX to Sipflex.
Use the Generic SIP Trunk template and our configuration guide to start testing.
No card required.