When you get a call in Cisco Jabber, you can choose to answer or decline it. You can also respond with a text message, in case you are unable to accept it.
When you receive a call from one of your contacts, you can choose one of the following options:
If you choose Chat reply, the call is automatically forwarded to your voicemail. A chat window with the caller also pops up, giving you the option to send a quick reply to the caller.
To use this feature you must have voicemail set up.