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

[Joseph Love]

Well, you win, it's definitely codec related.

Switching to ulaw causes this issue to go away.
I find it rather peculiar that the issue crops up in the first place.

If anyone is interested in packet traces of the problems I'm  
encountering with GSM, I can manage to arrange for those.

Thanks,
-Joe

On Jul 25, 2006, at 9:50 PM, Rich Adamson wrote:

> 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.
>
> Can you try different codecs just to rule out any issues with that?  
> E.g., if both devices use ulaw, do you still have the same problem?
>
> I've used both iaxcomm and x-lite to communicate with cisco,  
> polycom, grandsteam, etc, without that type of problem.
>
> Is it possible to obtain an ethereal trace of both the iax and sip/ 
> rtp streams in the same trace?  If so, a couple hundred packets  
> should be more then enough to see what's going on.
>
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