[Asterisk-Users] Re: Polycom sound quality problems

[Wiley Siler]

How can TOS tagging on the IAX channel affect a phone that is completely
SIP?

In my experience, the "robot voice" issue usually arises when bandwidth
restriction or latency occur on the data line providing the IAX call.
Assuming your connection is like this....

Sixtel IAX  --->  Asterisk Box  --->  Polycom IP500

Then you can see that the latency problem is on the IAX side.

What is your setup?

W


-----Original Message-----
From: asterisk-users-bounces at lists.digium.com
[mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of Noah
Miller
Sent: Friday, April 01, 2005 6:44 AM
To: asterisk-users at lists.digium.com
Subject: [Asterisk-Users] Re: Polycom sound quality problems

Hi Eric -

>>> I'm having a problem with my Polycom phones and hoping someone else 
>>> has experienced the same thing: Outbound calls are fine, and inbound

>>> calls originating from another SIP phone are fine, but inbound calls

>>> to the Polycom phone from an IAX channel sound like you're talking 
>>> to a robot.  The person on the Polycom sounds fine to the person on 
>>> the IAX channel, however.  Inbound calls to our soft phones sound 
>>> just fine.
>>>
>>> Asterisk 1.0.5 on Debian (also had the problem with 1.0 on Fedora) 
>>> Polycom SoundPoint IP500 SIP Sixtel is the IAX provider.
>>
>> Check to see what codec is being used for the call.
>> Sean
>>
> Default is U-law, but I also switched it to A-law with the exact same 
> results.

I might check out QoS.  You can specify TOS tagging on your IAX channels
in iax.conf, and the Polycom phones are able to respond to TOS tagging
(in ipmid.cfg - or in the web interface under "Core Conf").  
Maybe they are are trying to do two mutually exclusive kinds of TOS
tagging?  You can tell the Polycom phone to just not respond to TOS.

- Noah

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