Ciso VT Advantage, RTP and firewall

paa · ‎05-28-2009

Hi!

I have a strange problem with my ephones with enabled VT Advantage. Ephone always setup RTP stream using UDP port 1684. I setup VT Advanate, and after that I found that ephone use random UDP port for RTP. How can I set one ore some port range for it? I don't want to permit all UDP packets to/from ephones for security reasons.

gogasca · ‎05-31-2009

Are they IP Communicator?

or which phone model?

IP Phones SCCP we cannot select which port to use, only IP Communicator or IP Phone running SIP.

Are you sure that RTP is not video?

paa · ‎06-02-2009

There are 796(0,1,5) cisco ip phones. I don't know what type of traffic in this RTP. One things that I want - to understand, why with enabled VT outgoing RTP traffic started from random port in range 16284-32000, and without VT it started always from 16384.