This object specifies when the RTCP receive timer
is started.
disabled - timer is disabled
startImmediately - timer starts immediately
as soon as RTCP is enabled
on the call
startRtpOrRtcpPktRcvd - timer starts upon reception of
the first RTP or RTCP packet
startRtcpPktRcvd - timer starts upon reception of
the first RTCP packet