I installed AsteriskNow 1.7 yesterday, I'm able to access to its web GUI from other PCs which on the same VLAN. The AsteriskNow server has IP 192.168.0.11, I also have 2 used Cisco IP phones model 7940G which now on the same VLAN with AsteriskNow server. They can't call each other yet, what do I need to do? And please advise what the next steps would be? Thanks.