You need to create a queue (queues.conf) and assign the extensions to the queue, you can then set the various options for music on hold ringing, periodic announcements for on-hold time etc.

The strategy option will allow you to configure the ring type for the queue:
ringall - will ring all the extensions in the queue
rrmemory - round robin (sequential hunting)
random - random extension
leastrecent - extension least recently called
fewestcalls -extension with fewest calls

There are many options for calls queues. We've been installing asterisk systems for a few years and couldn't recommend enough


Network Support Engineer
Sheridan Computers
http://www.sheridancomputers.co.uk/