Hello,
I found something that I believe is problem with CANCEL processing in tm
module. I'm using openser 0.10.x today's cvs.
If openser forwards an INVITE and then it receives CANCEL before
it receives a provisional reply from INVITE recipient, it never forwards CANCEL
to its destination.
CANCEL is handled the same way as INVITE and I'm sure it hits t_relay().
Here's relevant part of the config:
xlog("L_INFO","$rm: cseq=$cs: ruri=$ru received from $si:$sp\n");
if (allow_trusted()) {
if (!lookup("location")) {
xlog("L_INFO","$rm: cseq=$cs: $ru: not found\n");
sl_send_reply("404","Not found");
exit;
}
xlog("L_INFO","$rm: cseq=$cs: lookup: $ru flags: $mF\n");;
route(1);
exit;
}
if (uri==myself) {
rewritehost("192.168.80.26");
route(1);
}
route[1]
{
xlog("L_INFO","$rm: cseq=$cs: $ru: RELAYING to $du (flags: $mF)...\n");
if (!t_relay()) {
xlog("L_NOTICE","$rm: cseq=$cs: ERROR: t_relay failed\n");;
if (!is_method("ACK")) {
sl_reply_error();
}
};
}
Here's ser log:
0(1015) INVITE: cseq=102: ruri=sip:[EMAIL PROTECTED] received from
192.168.80.26:5060
0(1015) INVITE: cseq=102: lookup: sip:[EMAIL PROTECTED]:5060 flags: 00000040
0(1015) INVITE: cseq=102: sip:[EMAIL PROTECTED]:5060: RELAYING to
sip:192.168.76.250:1058 (flags: 00000040)
0(1015) CANCEL: cseq=102: ruri=sip:[EMAIL PROTECTED] received from
192.168.80.26:5060
0(1015) CANCEL: cseq=102: lookup: sip:[EMAIL PROTECTED]:5060 flags: 00000040
0(1015) CANCEL: cseq=102: sip:[EMAIL PROTECTED]:5060: RELAYING to
sip:192.168.76.250:1058 (flags: 00000040)
0(1015) ACK: cseq=102: ruri=sip:[EMAIL PROTECTED] received from
192.168.80.26:5060
0(1015) <null>: cseq=102: onreply_route_log: received: 100 Trying from
192.168.76.250:1058
0(1015) <null>: cseq=102: onreply_route_log: received: 180 Ringing from
192.168.76.250:1058
I've replaced ip addresses with 192.168.x.x, but recipient is behind NAT.
As you can see according to this log CANCEL is getting relayed, but ngrep
actually shows that it's not sent and
invited client sends "Trying", then "Ringing".
It happens only if INVITE is already forwarded and CANCEL is received before
any provisional reply.
If CANCEL happens after openser received "100 Trying", everything works fine
and call is cancelled.
It looks to me as a bug or some kind of race.
Any clues?
Thanks,
Michael
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