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need help

Hello all,
I need help about  the below code. I cound not figure out what it does.


The below function is from ns-2/tcl/rtp/session-rtp.tcl

# Hook to enable easy syncronization with RTCP timeouts.
Session/RTP instproc rtcp_timeout {} {
        mvar rtcp_timeout_callback_

        if [info exists rtcp_timeout_callback_] {
                eval $rtcp_timeout_callback_
        }
}

I cound not find where rtcp_timeout_callback_    is defined, and what it
does?
Thanks in advance.


Kamil Sarac