I haven't narrowed it down, but Windows systems with Celeron processors seem pretty sensitive to system load causing lots of call quality problems. 

We also do a lot of call recording, and I suspect that the writes block and kill the quality.  I didn't figure this out in time to save our sipxtapi project though.  We are moving to a modified version of ekiga on Ubuntu linux.  I hope to be able to contribute to sipxtapi in my personal time, but that won't be very often.

Charlie

[EMAIL PROTECTED] wrote:
Keith Kyzivat wrote:
  
This depends on your processor speed.
Slow processors seem to show issues with audio quality.
It's been witnessed to happen even when not using RTP, so this is a bug in
the framework, and not in the connection...

Alex Chemeris may be able to answer you a bit better.

If you search the list archives, you should be able to find some other
information on this issue.

On 4/25/07, Xiaoming wang <[EMAIL PROTECTED]> wrote:
    

I underclocked my processor to 900Mhz and set in task manager to use
only 1 cpu core for my wxCommunicator and there were no audio glitches
during a call. I also used netlimiter to limit in/out bandwidth to
10Kb/s and call quality was still ok. But I have low latency 100Mbit
connection.

When I tested my softphone on computers with slower connection, there
were some audio glitches so I guess it's more a problem in handling
jitter than slow cpu.

Please check out http://www.akmalabs.com/downloads_netsim.aspx , maybe
we can use it to improve jitter handling in sipxtapi.

Jaroslav Libak
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