Dear All, Despite the solution provided in the microsoft knowledge base Q278887 that outgoing TCP port 6901 and UDP port 6901 should be open to allow voice conversation between a client running MSN Messenger Service behind the firewall and the external client (I mean not in my network at all), the desired result is still not yet achieved. I believe this should also work for users behind the ISA running in the integrated mode. "The voice conversation with .... has ended" is the message always displaced. They can use the voice aspect of the messenger service only within themselves behind the ISA. I've already opened port outbound TCP port 6901 and UDP port 6901 in the ISA as recommended in the knowledge base but no solution yet. Is there any other thing i need to do. Kindly put me through pls. wale A+, MCP+I, MCSE __________________________________________________ Do You Yahoo!? Make international calls for as low as $.04/minute with Yahoo! Messenger http://phonecard.yahoo.com/