19 Jul
2012
19 Jul
'12
5:27 p.m.
There is only one thing left: keep-alive. To keep the NAT pinhole open
you need periodic traffic from/to the client. Either enable NAT keep
alive on the SIP client, or on Kamailio (nathelper module and save() the
contacts just for the purpose of nathelper keep-alive) or on Avaya (e.g.
if Avaya can send periodic OPTIONS that could help). A dirty workaround
would be to set registration expiration to a small value, e.g. 45 seconds.
regards
Klaus
On 19.07.2012 15:40, Daniel-Constantin Mierla wrote:
Hello,
for dialogs (like subscriptions or invites), you have to use record
routing (see rr module) -- so for initial subscribe/invite you have to
add record-route header in kamailio, then do loose routing for requests
within the dialog (like notify) -- the default config file coming with
kamailio has such logic there.
For registrations, I would suggest the usage of Path extensions, which
is an ietf rfc, but the registrar server has to support that (avaya sip
server in your case). Alternative will be to replace the contact in
register (you can do it for subscribe as well) requests with ip of
kamailio and a parameter that encodes the nat box ip/port.
A similar mechanism is used by add_contact_alias() function from
nathelper module to help going through nat -- you can actually use it in
conjunction with record routing for invites/subscriptions.
Cheers,
Daniel
On 7/19/12 1:12 PM, Martin Schiøtz wrote:
Hi
I'm trying to configure kamailio version 3.3.0 to be a Session Border
Controller which only purpose is to handle far-end-nat.
On the far end site I have a SIP client with IP '192.168.1.2' which is
NAT'ed to IP 'zz.zz.85.230'. The SIP ALG is disabled on the NAT
firewall. The SIP client is communicating with the kamailio server and
the Kamailio server is forwarding every thing to an Avaya SIP server
'xx.xx.173.15' and vice versa. The kamilio is konfigured to do this
stateless.
The REGISTER and SUBSCRIBE part works fine. The kamailio is using the
'Via:' field and I also needed to do subst on the 'Contact:' field in
order for our SIP server to communicate back to the kamailio. But when
I get to the NOTIFY packet from the SIP server to the kamailio there
is no 'Via:' field or any other information about the SIP clients
IP/port and the Kamailio just sends back 'SIP/2.0 404 Not here.' to
the SIP server.
I guess that this can not be solved with a statless kamailio?
I guess that I need some kind of state table in the kamailio - is that
possible without doing REGISTER directly with the kamailio?
Any other good ideas are welcome?
Cheers,
Martin
Tell me if need more info the issue?
-----
#
T xx.xx.173.15:38059 -> yy.yy.159.211:5060 [AP]
NOTIFY sip:2001012@yy.yy.159.211:5060;transport=TCP SIP/2.0.
Call-ID: NjQ5ZDNlYzRjOWFjMzMzN2JlYzAwMTg4ODYwZTJlYWY..
From: "2001012"
<sip:2001012@bsosip.domain.dk>;tag=-667195155*1*016asm-callprocessing.sar229435981~1342570131099~1170998434~1.
To: "2001012" <sip:2001012@bsosip.domain.dk>;tag=7ca0af7d.
CSeq: 3 NOTIFY.
Contact: <sip:xx.xx.173.14:15060>.
Via: SIP/2.0/TCP
xx.xx.173.15;branch=z9hG4bK4DEAAD0E478B838008189457-AP;ft=xx.xx.173.15~13c4.
Via: SIP/2.0/UDP
xx.xx.173.14:15070;branch=z9hG4bK4DEAAD0E478B838008189457.
Via: SIP/2.0/TCP
xx.xx.173.14:15070;branch=z9hG4bK4DEAAD0E478B838018189455.
Event: message-summary.
Content-Type: application/simple-message-summary.
Content-Length: 69.
Subscription-State: active;expires=299.
Max-Forwards: 68.
User-Agent: AVAYA-SM-6.1.4.0.614005.
.
Messages-Waiting: no.
Message-Account: sip:2001012@bsosip.domain.dk.
##
T yy.yy.159.211:5060 -> xx.xx.173.15:38059 [AP]
SIP/2.0 404 Not here.
Call-ID: NjQ5ZDNlYzRjOWFjMzMzN2JlYzAwMTg4ODYwZTJlYWY..
From: "2001012"
<sip:2001012@bsosip.domain.dk>;tag=-667195155*1*016asm-callprocessing.sar229435981~1342570131099~1170998434~1.
To: "2001012" <sip:2001012@bsosip.domain.dk>;tag=7ca0af7d.
CSeq: 3 NOTIFY.
Via: SIP/2.0/TCP
xx.xx.173.15;branch=z9hG4bK4DEAAD0E478B838008189457-AP;ft=xx.xx.173.15~13c4;rport=38059.
Via: SIP/2.0/UDP
xx.xx.173.14:15070;branch=z9hG4bK4DEAAD0E478B838008189457.
Via: SIP/2.0/TCP
xx.xx.173.14:15070;branch=z9hG4bK4DEAAD0E478B838018189455.
Server: kamailio (3.3.0 (i386/linux)).
Content-Length: 0.
.
#
T xx.xx.173.15:38059 -> yy.yy.159.211:5060 [A]
......
#
T yy.yy.159.211:5060 -> xx.xx.173.15:38059 [AP]
SIP/2.0 404 Not here.
Call-ID: NjQ5ZDNlYzRjOWFjMzMzN2JlYzAwMTg4ODYwZTJlYWY..
From: "2001012"
<sip:2001012@bsosip.domain.dk>;tag=-667195155*1*016asm-callprocessing.sar229435981~1342570131099~1170998434~1.
To: "2001012" <sip:2001012@bsosip.domain.dk>;tag=7ca0af7d.
CSeq: 3 NOTIFY.
Via: SIP/2.0/TCP
xx.xx.173.15;rport=38059;branch=z9hG4bK4DEAAD0E478B838008189457-AP;ft=xx.xx.173.15~13c4.
Via: SIP/2.0/UDP
xx.xx.173.14:15070;branch=z9hG4bK4DEAAD0E478B838008189457.
Via: SIP/2.0/TCP
xx.xx.173.14:15070;branch=z9hG4bK4DEAAD0E478B838018189455.
Server: kamailio (3.3.0 (i386/linux)).
Content-Length: 0.
-----
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