asterisk users - Jun 2013 - packet counts: twice as high on one leg?

Hi all,

I have two phones that I've been comparing (different manufacturers).

To debug call quality issues on one of them, I've been using calls from 
the phone to our main DID, so 3 SIP sessions exist (phone <> asterisk 
then asterisk <> provider, and the provider<>asterisk for the DID).

The "bad" phone shows roughly twice the number of packets on the 
phone<>asterisk session as on the other two sessions.

The "good" phone shows roughly equal packet counts on each of the 3 
sessions.

I've used asterisk server MTUs of 1440 and 1500, but it makes no difference.

Is this double-packet-count a clue, a problem, or a red herring?

The packet counts are shown using "sip show channelstats".


- Mike

Have you checked whether the same codecs, or codecs with the same bandwidth
requirements, are used?

jg