QoS
RTP
802.1Q User Priority
IP ToS Minimize Delay
Enabled Disabled
IP ToS Maximize Throughput
Enabled Disabled
IP ToS Maximize Reliability
Enabled Disabled
IP ToS Minimize Cost
Enabled Disabled
IP ToS Precedence
Call Control
802.1Q User Priority
IP ToS Minimize Delay
Enabled Disabled
IP ToS Maximize Throughput
Enabled Disabled
IP ToS Maximize Reliability
Enabled Disabled
IP ToS Minimize Cost
Enabled Disabled
IP ToS Precedence
Other Protocols
802.1Q User Priority
The problem is not that it's choppy or breaks up. Asterisk is connected to the phone through two 100mbit switches, so throughput isn't a problem. It just sounds very distorted, like a cross between a robot and Donald Duck.
It really seems to be a problem with the way Asterisk is bridging the call from IAX to the phone. It does SIP <-> SIP bridges (not reinviting) just fine.
Noah Miller wrote:
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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