[asterisk-users] SPA-942 Sound Quality

[Jeremiah Millay]

For those of you out there with SPA-942s in production, do any of you 
have issue with the sound quality when using g.729 as the preferred 
codec? We are noticing terrible sound quality on the other end of a call 
made to a spa-942. Everything sounds crystal clear at the SPA itself but 
sounds like trash on the opposite end. After unplugging the spa and 
plugging in a Cisco 7960 to same ethernet cable and using the same codec 
we experience no problems. Its not a bandwidth issue. Packets are marked 
the same on the Cisco and SPA to match the QoS policies in our routers. 
I've tried using the default firmware, version 12 and the latest version 
of the firmware and still no luck. VAD is disabled. I even disabled the 
jitter buffer (which I think only affects the inbound quality which 
sounds just fine).
Any ideas would be greatly appreciated. I love the backlight on these 
phones, and the features are great but the quality is just not going to 
work for me as it is right now.
Thanks,
Jeremiah