squid proxy and apache servers

hi. pardon my noob question id just like to have a quick answer. i am planning to install a jabber webclient and a jabber server in our apache server. my boss said this wouldnt work because squid filters port 5222 connections (jabber). i told him we can simply 'unfilter' the port then but he said it wasnt possible. im not sure what he meant by that. can someone enlighten me please? im not new to linux but im very new to web/internet applications