By the looks of this screen shot of pbxnsip's PAC (pbxnsip attendant console) there are new features in store for this software based call control application for the pbxnsip phone system!
pbxnsip has taken a different approach than vendors such as Asterisk and 3CX by writting the call control application as a web application instead of a Windows forms application. This means that it could be made to run on PC, MAC and Linux. One of the challenges of this method could be getting a smooth & visually pleasing user experience.
From my testing of the PAC doing tasks such as forwarding a call to a mobile phone is very straightforward. Another interesting feature is the built in Intant Message client.
To see the pbxnsip PAC definition page click here.