[asterisk-users] odd sound between SIP & IAX clients

[Joseph Love]

Hi Tim,

Thanks for the suggestion.  Unfortunately the jitter buffer does not  
seem to be the culprit.  With it on or off, the issue still occurs.

I'm still playing with some testing of codecs to see if it's codec- 
related, as per Rich Adamson's suggestions, and will continue  
discussion of that idea once I can have a lengthy conversation with  
different codecs.  Preliminary checks with ulaw seem to hint that it  
might be codec-related, but I need a longer conversation to verify this.

Thanks,
-Joe

On Jul 26, 2006, at 1:09 AM, Tim Panton wrote:

>
> On 26 Jul 2006, at 03:04, Joseph Love wrote:
>
>> The issue which occurs is that the audio from the SIP client to  
>> the IAX client will spend most of it's time sounded very robotic,  
>> and garbled.  It is possible, although very difficult to  
>> understand someone who is on the SIP phone.
>>
>> I have asterisk 1.2.10 configured with realtime with both IAX and  
>> SIP clients.
>> The SIP clients include a Grandstream gxp2000 hard phone, and  
>> Counterpath's X-Lite 3 (for windows) softphone.
>> The IAX clients tested include idefisk (both windows & mac),  
>> JakenIAX, and LoudHush.
>> GSM is the preferred codec of both IAX & SIP clients, and is  
>> indeed the codec being used in all tests.
>>
>> Audio from the IAX to the SIP client does not experience any  
>> issues.  SIP to SIP (and presumably, although untested, IAX to  
>> IAX) communication does not experience any issues.
>>
>> We also have a T1 card through which many calls have been placed,  
>> both from the IAX and SIP phones, without any audio issues  
>> occurring, in either case.
>>
>> If it weren't for that there have been multiple clients tested to  
>> verify this robotic sound, I would cough it up to it being a  
>> incompatability between the particular clients, but this occurs on  
>> all SIP-IAX communication that has been tried.
>>
>> I'm running out of options as SIP-IAX intercommunication is kinda  
>> expected (and necessary for me), and out of good softphones for  
>> the mac, as most of the mac-compatible softphones are IAX2-based.
>>
>> Please let me know what additional information is needed to help  
>> me debug this problem.
>
> We have had reports like this, and it is looking like the iax  
> jitterbuffer is the culprit.
> Try adding jitterbuffer=no to the general section of iax.conf and  
> see if that helps.
>
>
> Tim Panton
>
> www.mexuar.com
>
>
>
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