"489-Event Package Not Supported" for MWI Subscription

Unanswered Question
Nov 20th, 2008
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I have CUCM-6.0.1. I have configured my third party SIP device to it. But while I am sending MWI SUBSCRIBE request, call agent is replying back with "489-Event Package Not Supported". What could be the probable reason?

Is it means that CUCM is not supporting MWI Subcription?

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