[cisco-voip] ISDN/MGCP question

[Matthew Saskin]

Answer to the newbie question - unchecking Display IE Delivery will most 
likely fix this.

-matt

Ed Leatherman wrote:
> 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 
> <mailto: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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