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Setting up Codecs for Telegram calls

When setting up SIP-accounts from some service providers or registering with PBX, whose settings we do not have in the list of server templates you may need to manually specify the list of codecs used and their priority.

Available codecs

Without compression
  • alaw
  • alaw/16000
  • mulaw
  • mulaw/16000
  • l16
  • l16/16000
  • l16/32000
  • l16/48000
With compression
  • gsm
  • ilbc20
  • ilbc30
  • amr
  • speex
  • speex/16000
  • speex/32000
  • isac/16000
  • isac/32000
  • gsm-efr
  • opus
  • g722/16000
  • g729
The digits after / are the sampling rate. If not specified, the standard 8kHz frequency is used. The exception is the Opus codec: it operates at 48 kHz.

mulaw is the telephony standard for the USA, alaw for Europe. /16000 are their high quality versions.

Opus is a modern, high-quality codec used by Telegram for calls. Opus is resistant to network loss.

L16 and variations via / are raw codecs. L16 is not loss tolerant and requires a good quality connection, so works best when connected directly to a WATS.

Example of setting a codec set

opus,g722/16000,alaw,mulaw,g729

Values are separated by commas, no spaces, case insensitive.


Read more about using Server Templates

See also

Payment methods and auto-renewal
Payment options for the SIP.TG gateway for transferring calls between Telegram and SIP telephony
Frequent problems and solutions
Frequent problems and solutions when setting up a gateway for calls between Telegram and SIP telephony
DTMF keypad settings
Setting up and using the DTMF keypad on Telegram calls
Setting up number conversion rules
Setting up number conversion rules for SIP accounts
Error codes
Error codes and their decoding that may occur when setting up a gateway for Telegram calls
Transferring tariff management
How to transfer fare administration to another user, transfer of fare administration, and transfer of ownership of tariff
SIP.TG account management request
SIP.TG account management request to help users whose user categories can access the function
Recommended ip telephony operators
IP telephony operators for different geographical areas, vetted by our team
Using Worker Servers
Purpose, benefits, installation and configuration of own Worker servers for SIP.TG
Using the Session Storage
Purpose, benefits, installation and configuration of your own Telegram Session Store for SIP.TG
Alternative to the tg2sip library (libtgvoip)
The crux of the problem with the tg2sip library (libtgvoip) with Telegram clients on Android and the proposed solution from SIP.TG
Documentation Overview