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Forward and Drop Operations for RTP and RTCP Gates

You can use the StreamMode property in the LocalControl Descriptor of H.248 messages to change the mode of Realtime Transport Protocol (RTP) gates without affecting the mode of Real-Time Control Protocol (RTCP) gates. That is, you can put RTP gates in drop mode while leaving RTCP gates in forward mode.

To view whether RTP and RTCP gates are in drop mode or forward mode, use the show services pgcp flows command. The following example shows a gate in which the RTP stream is in drop mode, and the RTCP stream is in forward mode.

user@host>show services pgcp flows

Gate id: 4295033089          
UDP      20.50.170.110:0     ->    20.50.170.2:1024 Drop I              0
    NAT source   20.50.170.110:0       ->     10.50.170.1:1024    
    NAT dest       20.50.170.2:1024    ->   10.50.170.110:20000   
Gate id: 4295033089          
UDP      20.50.170.110:0     ->    20.50.170.2:1025 Forward I           0
    NAT source   20.50.170.110:0       ->     10.50.170.1:1025    
    NAT dest       20.50.170.2:1025    ->   10.50.170.110:20001

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