[Asterisk-Users] Can not dial more then 23 calls

[Pudenz, Duane]

We are testing our Asterisk server prior to deployment.  The server has
a 4 port T1 Digium adapter (WCT4XXP) with 3 Long Distance (LD) T1s and
one PRI for local calls.

We are using sipp from two different stations routing a test number out
the LD lines and another test number out the PRI line.

We can not get more then 23 total active calls to connect to the test
numbers, the test numbers terminate to another PBX that we can monitor.
We have dialed out using cell phones to this other PBX while the test is
happening and it connects, meaning it has more then 23 active calls on
it.

If we place more then 23 calls then it seems to 'queue' the extra calls,
though not all of the extra calls complete after we stop adding new
calls.  They seem to get stuck in a queue or lost.  We will send 200
calls through the Asterisk server and all but about 20 do eventually
complete.  Those 20 or so are stuck as Asterisk thinks the channels are
busy with the calls when in fact there are no 'real' calls on the
server.

We can send 30 calls through the LD or PRI and only 23 are actually
connected at a time.  We can send 30 calls to both LD and PRI at the
same time and still only a mixture of 23 calls are actually active at
one time.

So our issue seems to be located in our Asterisk server.  Is there a way
to limit or throttle an Asterisk server so that it will not place more
then 'x' calls?  

We need to be able to support 48 calls.

Any ideas?