2 Mar
2008
2 Mar
'08
1:12 a.m.
Hi, very strange:
- I call to OpenSer using a TCP client.
- The INVITE arrives via TCP to OpenSer.
- I do:
$rd=ASTERISK_IP;
t_relay();
exit;
- Asterisk only speaks UDP of course.
- And OpenSer sends the INVITE to Asterisk by UDP.
WHY does it work??? I hoped it would fail trying to forward the INVITE by TCP
to Asterisk since I didn't force the outgoing socket, just the two lines
above.
Thanks for any explanation.
--
Iñaki Baz Castillo
2 Mar
2 Mar
1:14 a.m.
El Domingo, 2 de Marzo de 2008, Iñaki Baz Castillo escribió:
WHY does it work??? I hoped it would fail trying to
forward the INVITE by
TCP to Asterisk since I didn't force the outgoing socket, just the two
lines above.
Maybe OpenSer tries first with TCP (since the incoming INVITE uses TCP) and if
it can't establish a connection then it tries UDP? Is it RFC 3261 mandatory?
--
Iñaki Baz Castillo
4:18 a.m.
New subject: [OpenSER-Users] Does t_realy chooseTCP/UDP protocol if it's necessary?
Iñaki Baz Castillo writes:
Maybe OpenSer tries first with TCP (since the incoming
INVITE uses
TCP) and if it can't establish a connection then it tries UDP? Is it
RFC 3261 mandatory?
inaki,
how to select ip/port/transport of next hop is described in
J. Rosenberg and H. Schulzrinne, ÈSession initiation protocol (SIP):
locating SIP servers,É RFC 3263, Internet Engineering Task Force, June
2002.
-- juha
12:36 p.m.
El Domingo, 2 de Marzo de 2008, Juha Heinanen escribió:
Iñaki Baz Castillo writes:
Thanks Juha, now I understand that the only way OpenSer to set TCP for the
destination is by adding a RURI parameter "transport=tcp".
In fact, if I do:
force_send_socket(tcp:MY_IP:5060);
$rd = "ASTERISK_MEDIA_IP";
t_relay();
exit;
When I receive an INVITE via TCP OpenSer forwards it via UDP, the only way to
force TCP is by using:
add_uri_param("transport=tcp");
$rd = "ASTERISK_MEDIA_IP";
t_relay();
exit;
So it makes sense tieh the RFC you told me:
--------------------------------------------------------------------
4.1 Selecting a Transport Protocol
First, the client selects a transport protocol.
If the URI specifies a transport protocol in the transport parameter,
that transport protocol SHOULD be used.
Otherwise, if no transport protocol is specified, but the TARGET is a
numeric IP address, the client SHOULD use UDP for a SIP URI, and TCP
for a SIPS URI.
--------------------------------------------------------------------
Thanks a lot, I'm starting testing SIP TCP now and have not experience yet.
Best regards.
--
Iñaki Baz Castillo
Maybe OpenSer tries first with TCP (since the
incoming INVITE uses
TCP) and if it can't establish a connection then it tries UDP? Is it
RFC 3261 mandatory?
inaki,
how to select ip/port/transport of next hop is described in
J. Rosenberg and H. Schulzrinne, ÈSession initiation protocol (SIP):
locating SIP servers,É RFC 3263, Internet Engineering Task Force, June
2002.
5921
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Iñaki Baz Castillo -
jh＠tutpro.com