I'm running linphone version 3.9.1-1231-gecda7e6 on Ubuntu, configured
to use UDP (through NAT).
I read in https://tools.ietf.org/html/rfc5626#section-4.4.1
alive with CRLF
" MUST only be used with connection oriented transports
such as TCP or SCTP; it MUST NOT be used with connection-less
transports such as UDP "
yet when I wireshark my calls (which abort roughly one in every 4
calls) I find that linphone is sending double CRLF keepalives over
The code in static int send_keep_alive(belle_sip_channel_t* obj) in
listeningpoint.c appears to confirm this, since it sends a double CRLF
regardless of what transport is in use.
Please confirm / deny this analysis.