I manage a network infrastructure based on Catalyst 4500 series. From some time now, upper management decided to implement an IP Telephony solution. Unfortunately, the solution is not Cisco based. So far, I've managed to integrate the IP Telephony solution with the Catalyst voice vlan features with succes. The problem I am facing reffers to a new requirement for some users to have software IP phones (as opposed to hardware IP phones already in place and working just fine). Is it possible to have voice signaling traffic crossing from a user vlan to the voice vlan and back? I haven't been able to figure it out... Any advice is welcomed... Thank you.