Callback message not appearing on Siemens Hicom connected phones
We have connected two Siemens Hicom 350 PABXs using E1 controllers on two routers. The routers are connected via an IP (over ATM) link. Siemens digital phones are connected to each PABX. Calls are going across smoothly, however, when callback feature is initiated from a phone on one PABX to a phone on the other PABX, the initiating phone shows the message "Not possible" although the callback is actually set and does call back. The message should show as "Will call back".
Re: Callback message not appearing on Siemens Hicom connected ph
Ok, the situation now is pretty bright. I think you should have noticed the error in the second debug output. The Cisco has hard time in parsing/decoding the ISDN Q.931 packet and therefore shot an error message.
Could you provide me with the IOS versions of the gateways, or even better - the H323 versions they are running.
For the time being, I would recommend to you to issue the global command "isdn gateway-max-internetworking". With this command the Cisco gateways will try to do their best to pass transparently the unknown ISDN packets without trying to decode them. Let me know if that works.
After checking the H323 version, compiled into your gateway's IOSes, you should see if they are running H323 version 2,3, or 4. AFAIK, 12.3 IOSes are running H323 version 4, which has the ability to "tunnel" QSIG messages over the IP.
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