The Main Volume UP/DOWN buttons do not work for manual dialing. The VOLUME UP/DOWN buttons for individual channels in the Channels Panel work as expected.
The Main Volume UP/DOWN buttons buttons work as expected for Inbound Calls and Automatically Generated Outbound calls, but do not work with Manual Dial Next, Manual and Fast Dial Calls.
The issue is registered in Mantis:
http://www.vicidial.org/VICIDIALmantis/view.php?id=249
Asterisk 1.2.30.2
Astguiclient Trunk (2.2 rev. 1240)