[Sip-implementors] Unidirectional RTP!

[Rahul Gulati]

Hi,   I am investigating into how RTP can be addressed through NATs and firewalls.   Some of the solutions mention using bi-directional RTP. These need extensions to SDP, or using STUN/TURN where STUN clients residing in SIP-end equipment will need to send a request to the STUN server to get UDP NAT-bindings for RTP.   I had a few questions:   1) Is it possible to use uni-directional RTP in any of the above approaches? 2) If yes How?, Are there any sample call flows/drafts which I can refer for the same?   Would appreciate any help on this...   Best Regards' Rahul