I wonder why your question end up here in the OpenBSD mailing list. Anyways, for the PC-to-Server, do a cross-over(1236-6321) at both ends. If you want still, from PC-Switch-Server, two straight(1236-1236) wound do. For the PABX to your telephone, please be specific if these are Asterisk and VOIP phones. As a hint, crimp another cross-over and straight thru cables and check. If the light is litting up and you can hear a dial-tone from the phone to the pabx, then that is the cable connection.
Hope it helps. > here's the diagram. --> http://203.177.22.150/lan_voice.jpg > >> can u draw a ASCII rough sketch of what you are trying to do? >> >>> guys i want to hear some comments / suggestions from you. we are >>> planning >>> to network a company. using a cat5e, the 2 pairs(4 wires) will be using >>> for LAN and the remaining 2 pairs(4 wires) will be use for pabx.