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Tel2 and Asterisk
Learn more about how Tel2 utilize open source technologies like Asterisk to build a world class network.
We are Asterisk Specialists
Tel2 is deeply committed to open source technologies like Asterisk, Freeswitch, and OpenSIPs. We utilize these open source products extensively within our network. By embracing open source initiatives, we aim to contribute to the community, keep costs low, and lead with constant innovation and smart features.
We pride ourselves on being the most 'Asterisk friendly' carrier in the UK. Our services focus on Asterisk-centric protocol support. Whether you're using plain Asterisk or popular distributions like FreePBX, Elastix, or Issabel, we offer in-house expertise to assist with setup, configuration, and troubleshooting.
With Tel2, you can rely on our passion for Asterisk to provide you with peace of mind. Here are some of the ways we support you and your Asterisk platform:
IAX2 Protocol Support
IAX2 has a number of advantages over the SIP protocol including:
- IAX2 trunking is more efficient with your Internet bandwidth when making multiple calls - often using less than half the bandwidth of the equivalent SIP calls using the same voice codec. For example eight G.729 calls using SIP will use around 250kbps with SIP but less than 100kbps using IAX2 trunking.
- With IAX2 it is easier to connect to us when behind a router or firewall as a single port number is used for both signalling (call setup information) and media (voice traffic). This removes the complexity of traversing some problematic firewalls etc. and removes problems with no audio or one way audio etc.
- DTMF traffic is always out of band removing any confusion about which DTMF method to use
For more benefits of IAX2 click here
Asterisk Media Support
We support all the main Asterisk codecs and media protocols including:
- G.722, iLBC, G.729a, GSM, G.726, G.711 alaw and ulaw voice codecs
- H.264 and H.263 video codec support
- T.38 and UDPTL support for faxing
- SIP Subscribe for Presence and BLF
- OPTIONS and NOTIFY Support for Message Waiting
- TLS and Secure RTP support for encyrpted media
Technical Support
The team at Tel2 understand and support Asterisk better than any other carrier in the UK.
Here are some of the ways we can help you:
- Wireshark captures to identify faults
- IAX2 and SIP protocol logging to identify issues
- Console debug logging
- Fraud management systems to protect customers
- Access to our Partners Programme
Asterisk Configuration Guides
Configure SIP Trunk using CHAN_SIP
Please take a look at our CHAN_SIP configuration guide by clicking here
Configure SIP Trunk using PJSIP
Please take a look at our PJSIP configuration guide by clicking here