[asterisk-users] SPA-942 Sound Quality

[Andres]

Jeremiah Millay wrote:

> 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. 

Sure, just modify the RTP Packet size on the SPA-942 to what you are 
using (probably .20).  The phone comes preconfigured with .30 which can 
cause an odd behavior like what you describe.

> 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
>
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-- 
Andres
Technical Support
http://www.telesip.net