rtpkeepalive=30 is used to send keepalives in the RTP stream to keep NAT open.
rtptimeout=60 allows to terminate call if 60 seconds of no RTP or RTCP activity.
My question is: will rtpkeepalive prevent rtptimeout from occuring? I would love to keep rtptimeout cause sometimes, when users hang up, the line tends to stay connected. So we assume that a total RTP or RTCP silence of 60 seconds would mean that nobody is really on the line. That will avoid excessive expense related to overbilling.