Since there has been no response to your post, it appears to be either too complex or too rare an issue for other forum members to assist you. If you don't get a suitable response to your post, you may wish to review our resources at the online Technical Assistance Center (http://www.cisco.com/tac) or speak with a TAC engineer. You can open a TAC case online at http://www.cisco.com/tac/caseopen
If anyone else in the forum has some advice, please reply to this thread.
Have run across ringback problems with Call Manager and H.323 PRI gateway (3640 with HDV-T1 module, PRI from telco). Various ringback problems when getting ISDN call alerting messages vs call proceeding messages, i.e. when calling off local telco network, I would not here ringback; long distance callers inbound wouldn't hear ringback, etc... Upgrade of code later than 12.1.3xj or 12.1.4?. Suggest opening a TAC case as there a bunch of ISDN settings that can come into play..
Just in case you are still having problems, you should be able to do this. You need to be running CallManager 3.0(9) or later, and there is a service parameter you need to add if not already present called ToSendH225UserInfoMsg which should be a boolean value set to True.
Also you need to have a minimum version in the 12.2 train but it depends on which platform you are using as to which would be the recommended version at this time.
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