sip calls garbled (PCMu/a)
Submitted by Eric Drechsel
Assigned to Olivier Crête
I use Gizmo service with Google Voice. Twinkle is my benchmark SIP client, since I've found it to be very reliable compared to other clients available in the Ubuntu repos, especially "on the go" connected to random NATed wireless access points.
I would like to use Telepathy/Farsight/Empathy for SIP calls since it integrates well with the Gnome desktop and unifies my realtime communications. In previous releases SIP registration and call connection were broken, but now these issues are resolved.
Unfortunately, audio during calls is garbled (syllables seem to appear out of order, drop etc), while in Twinkle with the exact same setup, audio is solid. I've tested on a variety of networks, including both fast, public IP connections and behind NAT, with the same results: Twinkle voice quality is solid, Empathy voice quality is unusably glitchy.
The empathy log and twinkle log both show the codec negotiated as PCMU/A.
Since this is a quality issue, not one that is easily traced, I would suggest other interested users test with both Empathy/sofiasip and Twinkle (or other solid client) and post results.