[asterisk-users] Calls in ulaw, not gsm as desired

[Salvatore Giudice]

Take a packet capture and look at the Polycom's SDP. It will be listed in the 'a=rtpmap' if iLBC is available.

My bet is that you will only see:

a=rtpmap:0 PCMU/8000
a=rtpmap:8 PCMA/8000

--------------------------------------------------
Salvatore Giudice
Salvatore.Giudice at VoIPSecurityTraining.com

VoIP Security Training, LLC
http://VoIPSecurityTraining.com

848 N. Rainbow Blvd. #1676
Las Vegas, NV 89107
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Fax: (214) 279-2906


-----Original Message-----
From: asterisk-users-bounces at lists.digium.com [mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of Rob Schall
Sent: Wednesday, May 02, 2007 5:30 PM
To: Asterisk Users Mailing List - Non-Commercial Discussion
Subject: Re: [asterisk-users] Calls in ulaw, not gsm as desired

I see this. However, ulaw works fine. I believe alaw works as well. So I
don't think their site is either correct, or they didn't mean it like that.

Rob


Jerry Jones wrote:
> A simple glance at their website will tell you this about the 501
>
> " G.711 μ/A and G.729A (Annex B) configuration "
>
>
>
> On May 2, 2007, at 12:22 PM, Jaswinder Singh wrote:
>
>> Try ilbc if the phone supports (free) or g729  ( better but your
>> asterisk will need license if you want to transcode calls from g729
>> to other codecs or want to record calls ) .  Also check your phones
>> config if its support multiple codecs . .
>>
>> On 02/05/07, Rob Schall <rschall at callone.net> wrote:
>> So I reloaded things and had just gsm set for 2 of my polycom 501
>> phones. However, the logs say "No codec found", which leads me to
>> believe that polycom 501 phones can't use gsm. Does anyone have
>> something like this working? If not gsm, is there a better option
>> with these phones over a low bandwidth situation?
>>
>
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