[cisco-voip] ISDN/MGCP question

[Ed Leatherman]

Hoping a resident gateway guru can take a peek at this, to see if i'm
barking up the wrong tree here

We have a remote office with a legacy PBX of some sort which we have
interfaced with our call manager 5.1.3 system via a PRI to a 2811 router
(MGCP controlled). Has been working fine for about a year, but the past few
days they are no longer able to call IP Phones on our network.. but they can
make calls out of our PSTN gateways here on the main campus. Basically they
call an IP Phone, it rings here but then has reorder tone. Calls setup and
complete fine in the other direction, it's only calls from the remote site
to main campus IP phones that cannot connect.

I'm trying to get their telecom partner to take a look at their switch as
well to see if anything changed, but trying to do my own troubleshooting in
the meantime.

I'm poking around at the trace files,
>From the call manager point of view, everything appears to work fine in the
ISDN/MGCP call setup from what I understand, up until the CONNECT portion; I
send CONNECT message to the remote switch, and get a STATUS message back
with an error about IE not implemented, which is then followed up by a
DISCONNECT from call manager. Right after I send the DISCONNECT I get the
CONNECT_ACK that I was supposed to get from the initial CONNECT message.
Then the call tears down normally.

>From the IP Phone side, the media stream opens and then closes immediately
according to the trace file.

My question is, is the status message coming in before the connection_ack
what is causing call manager to drop the call?
Newbie question, can I just uncheck "Display IE Delivery" in CCM to get rid
of that error?

OUT:
CONNECT, pd = 8, callref = 0x8001
Display i = 'Ed Leatherman'

IN:
STATUS, pd = 8, callref = 0x0001
Cause i = 0x81E3 - IE Not implemented
Call State i = 0x04 - Call delivered, ITU-T standard

OUT (MGCP):
MGCP Version 0.1
S0/SU0/DS1-0/23 at HSC-East-VGW-1.nsog.wvu.edu
Sequence 792352
NotificationRequest (RQNT)
RequestIdentifier(X): 17
RequestedEvents(R): D/[0-9ABCD*#]
SignalRequests(S)
QuarantineHandling(Q): process,loop

OUT (ISDN):
DISCONNECT, pd = 8, callref = 0x8001
Cause i = 0x80E5 - Message not compatible with call state or protocol error
threshold exceeded

IN (ISDN):
CONNECT_ACK, pd = 8, callref = 0x0001


-- 
Ed Leatherman
Senior Voice Engineer
West Virginia University
Telecommunications and Network Operations
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