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In Cisco CallManager 4.x, when an inbound call to an IP phone is answered by a cellular phone with MobilityManager, the call drops
On Cisco CallManager 4.x with MobilityManager when the Mobile Connect feature is used, an inbound call rings an IP phone as well as a cellular phone, but when the call is answered from the cellular phone, the call drops and the calling party hears a busy tone. If the call is answered from the IP phone, everything works fine.
In order to resolve this issue, complete these steps:
First update the Java Telephony API (JTAPI) Plugin from the Cisco Unified MobilityManager Administration Window.
Choose System > System Parameters.
Change Enable Auto Update JTAPI File, and choose Yes to Always Update JTAPI File.
Also, uncheck SSL for CCMPluginsServer in IIS Manager.
If there is a phone in the remote site, make sure that the Transcoder is added to the media resource gateway list (MRGL).