Hope all is well with you :)There is nothing to configure in CCM to start using Headsets on a 7940. There are many compatable makes and models available, many require a special cord to connect to to Cisco phone models. We are a Plantronics shop here at our Campus, so I can only give you feedback on them. We have many of the 3 models listed below working perfectly with 7941's and 7961's and other 7940's and 7960's.
Corded - Plantronics H171 or H17N (N = noise cancelling) ** nice lightweight Headset with multiple user wear options.
Make sure that you also order the following part for any Plantronics corded models;
Part# Amp 26716-01
Cordless - Plantronics CS50,CS55,CS70 - Great coverage (up to 200-300 feet) multiple channels (CS50 - 900mhz CS55 - 1.9khz) 8 hour battery life.
Theoretically the Headset and Speakerphone *MAY* be disabled in the CallManager (in the bottom of the phone's configuration screen), however it's non-default setting. Since the Headset cannot be disabled alone, just check your Speakerphone. If it works, your Headset should be enabled.
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.