Common Voip audio codecs to be implemented 
GSM 06.10
G.729
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G729 encoding is not supported by ffmpeg yet:
The G729 codec may have a royalty requirement. However, any plans for GSM ?
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The G.729 codec is royalty-free since January 1, 2017.
As of January 1, 2017 the patent terms of most Licensed Patents under the G.729 Consortium have expired.
With regard to the unexpired Licensed Copyrights and Licensed Patents of the G.729 Consortium Patent License Agreement, the Licensors of the G.729 Consortium, namely Orange SA, Nippon Telegraph and Telephone Corporation and Université de Sherbrooke (“Licensors”) have agreed to license the same under the existing terms on a royalty-free basis starting January 1, 2017.
For current Licensees of the G.729 Consortium Patent License Agreement, no reports and no payments will be due for Licensed Products Sold or otherwise distributed as of January 1, 2017.
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yes please support the GSM 8 kHz codec for both desktop and mobile clients
GSM encoding is not supported by FFmpeg yet:
on that link it says
GSM E X encoding supported through external library libgsm
Other open-source SIP projects using the GSM codec
- Linphone: BC / public / external / gsm · GitLab
- tSIP: tSIP/gsm at master · tomek-o/tSIP · GitHub
- MicroSIP (source tarball only)
Other open-source SIP projects using G.729 codec
- Linphone: BC / public / bcg729 · GitLab
- tSIP: GitHub - tomek-o/tSIP-plugin-g729-bc: tSIP softphone G.729 codec plugin, based on bcg729
- MicroSIP (source tarball only)