I don't know of a way to turn on only the headset. You can disable the speakerphone or the speakerphone and headset. You can do this by going to CCM admin -> Device -> Phone. Find the phone that you want to modify. On the phone configuration page under Product Specific Configuration, check the box to disable the speakerphone or the speakerphone and headset.
By default, the speakerphone is enabled on Cisco IP Phones. However, you can disable it on Cisco IP Phone models 7960 and 7940.
To disable the speakerphone on these models, choose Device > Phone from the Cisco CallManager Administration application and locate the phone you want to modify. Check the Disable Speakerphone check box to disable the speakerphone for the phone you have selected.
Disabling the Headset
To disable the headset on these models, choose Device > Phone from the Cisco CallManager Administration application and locate the phone you want to modify. Check the Disable Headset check box to disable the Headset for the phone you have selected.
If you access ip phone network configuration menu and scroll down to option 45, it shows Headset Mode is disable. Though I change the setting to "Auto Answer with Headset" from line configuration page in CCM and reset the phone, it is still showing disable. Any advice?
What is the exact usage of that Headset mode showing on an ip phone network configuration menu? I guess we can simply hit the headset buttion on an ip phone when connecting a headset to it. Thanks for the advice.
Option 45,actually refers to "Handset Only" Mode not Headset Mode.This mode refers to whether or not you have the Headset and Speakerphone (both)disabled thus putting the phone in "Handset Only" mode. I guess this Option would be handy to view if one of your users was complaining about not being able to use the Headset or Speakerphone on their set and you didn't have access to the GUI.
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.