I have CUCM 6.1.3 and I would like when a call is made to another internal user, that if they are on the phone, it could let the calling party know somehow that they are on the phone, like the old nortel phones used to do. Is there a way to do this in CUCM, so that the calling party can know if they called party is on the phone or not? Thanks in advance for the help.
You can use Busy Lamp Field in 2 primary ways. The first is through the directories on the phone. If you have basic presence (which is what BLF) is configured within the CUCM cluster, then users can see the status of other users through the missed/placed/received calls directory on the phone. In addition, it can be seen within the corporate directory on the phone. If you don't dial a user via one of these options then you would not see the status.
The second is BLF Speed Dial. This is a one-to-one mapping of user to speed dial (with BLF). This wouldn't scale for a global (internal) solution.
You could consider going with Presence server. You could via the CUPC client see the presence/status of all of the "buddies" in your list before you call or IM then. Presence would require licensing (depending on your current licensing model), servers, and a new application to be built and maintained.
If you have Unity or Unity Connection, you could leverage the Busy greeting option - however, if your intent is to put folks on hold then this wouldn't satisfy that requirement. You could configure a greeting that says (example), "Hi, this is John and I'm on the phone. Please leave a message and I'll return your call when I can".
Cisco has a more elaborated and robust presence solution called Cisco Unified Presence Server or CUPS (e.g. specialized software running on a separate hardware). CUPS sometimes is referred as presence.
Although the term presence is mentioned in the documents in my previous post, that doesn't mean you need CUPS to get basic presence capabilities in CallManager. As David has said, CallManager have a built-in basic presence feature that is configured by means of BLF/Speed dial buttons, call list and directories.
Wherever you read about presence, you must understand it as a feature that allows a user to monitor the real-time status of another user.
Hope that helps to clarify, please rate if it does.
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