Want to make sure I understand why a caller might not hear "ringing"
when
outbound calling.
A SIP phone is behind a firewall and is registered to an asterisk
server on a public network. Sometimes (but not always) when placing an
outbound call there is no ringing before the remote party answers. Its
not that the remote party picks up very quickly - the delay may be as long
as twenty seconds before it is answered (and I must assume that the remote
phone had rung at least a few times).
I vaguely understand that part of the SIP call setup includes a
"ringing"
message, sent from asterisk to the originating phone. If this is correct
and the firewall for whatever reason isn't passing this message, will
there be no ringing sound on the originating phone? This is confusing to
me, as I kind of assumed that the ringing sound was in audio, and would be
part of the RTP stream. But perhaps that isn't even flowing yet.
Guess I am showing my SIP ignorance. Please enlighten ;)
Cheers,
j
