IAX2 IS STILL FIRST-CLASS
UK IAX2 trunks for Asterisk and FreePBX.
Sipflex continues to provide IAX2 as a supported connection method for open telephony systems that need it.
One complimentary channel per account. Add capacity for £1 per channel.
WHY IAX2?
A practical option for the right system.
IAX2 combines signalling and media in a single protocol and is native to the Asterisk ecosystem.
Straightforward NAT
One protocol and a predictable network path can simplify firewall and NAT configuration.
Asterisk-native
Designed for the Asterisk ecosystem and available in compatible systems including FreePBX.
Efficient trunking
Suitable for installations that deliberately choose IAX2 for inter-system voice traffic.
SIP OR IAX2?
Choose based on your application.
Use SIP for the widest platform compatibility. Choose IAX2 when you operate Asterisk or a compatible PBX and value its single-protocol model.
DOCUMENTED SETUP
Configure it without a support ticket.
The guide covers account credentials, context, codecs, trunking options and Asterisk CLI checks. Sipflex advises on the service; you remain responsible for your PBX and network.
30-DAY FREE TRIAL
Test a UK IAX2 trunk for 30 days.
No card required. Configure Asterisk or FreePBX using the credentials in your Sipflex portal.
No card required.