You can use the integrated chat window to communicate with other users without tying up their line or having to interrupt a connected call. To start a conversation, open the Presence window, then right-click on the extension or user you want to send a message to and click the Send Message option on the pop up context menu.

User/Extension details: The current call status is indicated here by the icon. Users can also enter the status text that they wish to be displayed to other users by clicking on "Absence text" and typing the appropriate text.
Search text/number to dial: To filter the list of users/extensions, text can be typed into this box and the list will update to only show items containing that text.
Call status icons: These icons indicate the current call status of each user/extension.

Presence options: If you want to personalise your Presence window to include just the contacts that you need, then you can do this using these options. The other styles that you can choose, instead of extensions, are Users or Custom. The user list is for hot desk oriented sites. These are sites where staff moves around and hence the list is oriented toward who is available and where they are, rather than which extension is available. In user mode, the users are shown as coloured "chess pawns" instead.

The Users view will also update the "State" field of the user based on the status of any devices that the user has logged in with (for example; PC client, mobile client). So the user will show as red if they are either busy on the desk phone or mobile phone.
Context menu: If you right-click on one of the entries in the Presence list, then a context menu should appear. Assuming that you are not already on a call, then the menu should contain the Make Call item. By choosing this action, you can dial the extension directly.

If you had been on a call already, then the choices would have been Announce and Transfer in place of Make Call. This is appropriate because, if you are already on a call, then the expectation is that you are clicking on the extension with a view to transferring the call to them.
If you see an extension that is flashing red then it means that the extension has a call ringing at it. Right-click on the extension and the context menu will include an option to pickup the ringing call.
Clicking the Send Message option on the context menu will open the integrated chat window. Then you can send instant messages directly to that user or extension. Full information on messaging can be found in the Messaging chapter.
You can also right-click on an extension and select the Call History option to see their Call History. You need to have a security policy with sufficient rights to do so but you can use their call history as easily as your own with all the functionality intact.
Call information: Other information about the current call.
The Presence window also allows you to see your co-workers #ANDROIDMOBILENAME current location ("Location Update Frequency" must be turned on the Mobile client). Your co-workers location will be reported as a text description of their geographical location back to the Navigate UC Server server (Navigate UC Server requires internet access for this feature). The geo-location of co-workers mobile device is made visible to you via the location field in the Presence screen or by clicking on "Show on map" option which will open the web browser to show the user’s approximate location in Google maps.