[Serusers] RTPproxy debug

[Joao Pereira]

Hello to all,
Is there any way of making debug in RTP proxy?
My SER has one public IP and one private IP. The public phones can speak 
each other, but the private IP phones can t speak each other (they just 
ring, but theres no voice ) , and apears this error on SER:
 ERROR: send_rtpp_command: can't read reply from a RTP proxy

How can I debug RTPproxy?
Thanks

Joao Pereira
www.fccn.pt