[asterisk-users] SPA-941 (and others ) Transmit Sound Quality

[nivlekch]

ron,

i recently fixed the poor quality with our spa942 using canreinvite=yes
have you found out the problem with your spa941? i can't get around the 
problem of poor quality audio when the rtp pass through *

ron at iamron.net wrote:
> Hello,
>
> This is not exactly an Asterisk question, but I was encouraged to seek
> advice here anyway. The kindness of the * open source community is
> legendary :)
>
> I am getting going with an Asterisk 1.2 box, and I'm having trouble
> getting good quality transmit sound using handsets with VoIP phones. I'm
> primarily trying to focus on SPA-941, but also experimenting with Aastra
> 9113i and Uniden UIP1868. I do not at this time have any PSTN cards in the
> box to provide hardware timing.
>
> The use case is calling from the SIP phones (which are extensions
> registered with the * 1.2 box) to a VoIP termination service which routes
> the call to a PSTN number. Everything sounds great on the SIP phone, but
> the sound on the other end of the line is distant and missing bass, most
> especially so on the SPA-941 (which is the phone we really want to use).
> If I use the default handset mic gain value of 0db, the sound is so loud
> for the other person they have to hold the phone away from their ear. If I
> set it to -6db, it is still too quiet. The Aastra 9113i sounds a little
> better, and the Uniden 5.4 GHz Cordless sounds actually very good, so I'm
> pretty sure my network setup is capable of transmitting good sound. Using
> the speaker-phone on the SPA-941 sounds significantly better than using
> the handset. But we need the handset to also sound good.
>
> I've tried different providers etc. and always come back to the phone. I'm
> using G711u codec in all cases and silence suppresion is off.
>
> I saw a previous thread that mentioned changing the RTP from .03 to .02,
> however the post was regarding a MeetMe issue. I tried anyway, and it
> introduced an echo on the line.
>
> I've seen many rave reviews regarding the sound quality on the SPA-941, so
> I'm wondering if maybe I got a bum handset? Would anyone be willing to
> receive/place a call to tell me if it sounds the way its supposed to or if
> there is indeed a problem?
>
> All suggestions/recommendations greatly appreciated.
>
> Much thanks,
>
> -- Ron
> ron at iamron.net
>
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