Parameter: Remote Method
From TBwiki
Which NAT traversal method to use for Remote Endpoint.
- No NAT: Remote device is not behind a NAT or remote NAT device is SIP/RTP aware.
- Force Passive Mode: Use IP address and port from first received RTP packet to starts sending RTP packets.
- Direction Attribute: Uses 'Passive Mode' only when 'a=direction:active' is received in the SDP.