This is a strange one. When calling from the phone using the speaker, the call is completed fine. During the call if the handset is picked up, then the call will drop. This is not an everytime issue and has occured on both a 7940 and 7960 phone. The phones are connected to CM 4.1(3) through an MPLS WAN.
I have been seeing this for a while now on some of my older phones (7940 and 7960). After contacting Cisco TAC they referred me to a document detailing the cleaning of the actual hookswitch for the handset.Cisco maintains that becuase calls can be intiated from the speakerphone or the line buttons on the side of the screen, that it must be stuff interferring with the contacts of the handset hookswitch.
Are you getting this error “Installer User Interface Mode Not Supported. The installer cannot run in this UI mode. To specify the interface mode, use the -i command-line option, followed by the UI mode identifier. The value UI mode identifiers...
The below trick might come handy when you have to add a new node to a cluster but you don't have or is unsure of the security password for the publisher. This procedure has been around for ages.
1) Login into the CLI of the Publisher.