asterisk users - Mar 2003 - IAX calls drop suddenly?

Hi,

I've got asterisk working as a PSTN gateway between two sites.  The
IP connection is pretty good and bandwidth exceeds 640Kbps all the
time.  I'm using X100P hardware on 300Mhz and 333MHz systems.  One of
them has a sound card, but the slower system does not have a sound
card.  Both are connected to PBXes and I have busydetect=yes on one
end because the PBX doesn't drop the voltages at disconnect.  The 
other has a more normal ATA for the analog port.

I've searched the FAQ, mailing list archives, and documentation and I
don't see this matter addressed.  I'd appreciate any help you all can
offer.

My problem is that the calls drop suddenly while the call is in
progress, at random times.  Sometimes the call proceeds for several
minutes before dropping, and sometimes it drops within seconds.

I have bandwidth=low in iax.conf on both ends.

I don't even know what else to look at or what to try to change, to
make this problem go away (or to be less apparent).  What I want is
for the IAX systems on each end to be a little more "forgiving" of
IP latency/jitter etc. before abruptly disconnecting/dropping the
call.

Please let me know what sorts of things I can try to do to make the
VoIP calls more reliable between these gateways.

Thank you!

-- 
Jim Ockers (ockers at ockers.net)
Contact info: please see http://www.ockers.net/

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>I've got asterisk working as a PSTN gateway between two sites.  The
>IP connection is pretty good and bandwidth exceeds 640Kbps all the
>time.  I'm using X100P hardware on 300Mhz and 333MHz systems.  One of
>them has a sound card, but the slower system does not have a sound
>card.  Both are connected to PBXes and I have busydetect=yes
Do the calls drop after they are bridged to PSTN ??
If so busydetect=yes or callprogress=yes is suspect
the logic on these flag can some times misinterpret the channel status & try
to hang up a channel

> My problem is that the calls drop suddenly while the call is in
> progress, at random times.  Sometimes the call proceeds for several
> minutes before dropping, and sometimes it drops within seconds.
>
> I have bandwidth=low in iax.conf on both ends.
>
> I don't even know what else to look at or what to try to change, to
> make this problem go away (or to be less apparent).  What I want is
> for the IAX systems on each end to be a little more "forgiving"
of
> IP latency/jitter etc. before abruptly disconnecting/dropping the
> call.
This sounds like the busydetect=yes is detecting some busy conditions.
I'd be happy to work with you to try to diagnose off-list, preferably on
IRC.

Mark