[Serusers] Cisco phones port range

[Joao Pereira]

Hi
Im using Cisco IP 7940 (with SIP firmware) and I want to force him to 
put the media stream in some specific port.
To do it I put this in the Cisco configuration file:

start_media_port: 8000       
end_media_port: 9000       

but the Cisco IP phone boots and doesnt accept these ports, and assumes 
the defaults (16384-32766).

Even when I put these ports directly in the phone configuration, he 
doesnt accept them.

How can I change the RTP ports in the Cisco IP phone?
( Like in Xlite we do: "System Settings"-> "Network" -> "Listen RTP port" )

Thanks
Joao Pereira