Thanks. It's good to know that it should work.
It's a 2811 running IOS 12.4(25g).
[a] ===> [kamailio] ===> [cisco] ===> [b]
This is exactly what I need. I'm trying to modify the request at [kamailio] so that [cisco] forwards to [b].
Possible complication is that [cisco] is also configured as a voice gateway with a SIP trunk to an external provider and a Call manager on the inside. However, this is independent SIP traffic that [cisco] appears to try to route according to voice rules.
I can get the call to proceed by adding a dial-peer to [cisco] config, but if I have understood loose-routing, that shouldn't be necessary.
I have tried several combinations of header and r-URI modifications to test [cisco]'s behaviour, including Route:[cisco];lr but it still seems to respond to the r-uri in the way I initially described.
All the best,
Dave
Message: 3
Date: Wed, 14 Aug 2013 13:06:19 +0400
From: Alex Balashov <abalashov@evaristesys.com>
To: miconda@gmail.com, "Kamailio (SER) - Users Mailing List"
<sr-users@lists.sip-router.org>
Subject: Re: [SR-Users] Loose Routing with Cisco router
Message-ID: <65a98f42-c370-49fe-91c4-d018b3d61249@email.android.com>
Content-Type: text/plain; charset=UTF-8
I use Kamailio extensively with Cisco AS5xxx series gateways and they have never had a problem dealing with Kamailio's RRs and lr values.
Daniel-Constantin Mierla <miconda@gmail.com> wrote:
Hello,
what model the cisco router is?
From what I understand, you want to go from:
[a] ===> [kamailio] ===> [b]
to:
[a] ===> [kamailio] ===> [cisco] ===> [b]
The usual will be that kamailio sets the r-uri to [b] and dsturi
(outbound proxy) to [cisco] and then relay. The cisco should have some
config options just to forward the traffic based on r-uri, however I
never had to deal cisco configs. Maybe you add a Route header with
[cisco];lr, then it should match itself in the route header and send to
r-uri.
On the other hand, when I had to interoperate with cisco
gateways/b2bua,
they had no problem understanding loose routing added by kamailio.
Cheers,
Daniel
On 8/13/13 10:05 AM, David Wilson wrote:
Hello All,
I'm running Kamailio 4.0.2 on Ubuntu 12.04 (precise).
I have SIP messaging flowing nicely, with UACs registering via
Kamailio (as a proxy) to a Registrar.
Now having problems trying to route messages via a Cisco router
(12.4(25g)) using loose routing. The plan is to allow the router to
see the SIP messaging but forward it to the original location.
RFC 3261 seems to cover this case in Section 16.6 part 6: "A proxy
MAY have a local policy that mandates that a request visit a specific
set of proxies before being delivered to the destination."
Cisco documentation (SIP Configuration Guide, Cisco IOS Release 12.4)
states that it implements RFC 3261, including Loose-routing. However,
from my observation the router doesn't like a request-URI with anything
other than its own IP address (it returns 400 Bad Request - 'Invalid IP
address'), but with any attempt to 'decorate' the URI with lr and/or
maddr= parameters it returns 400 Bad Request - 'Malformed/Missing' URL.
One of these messages is returned regardless of anything I've tried
with Via, Record-Route or Route headers.
Desired behaviour is for the router to remain in the route-set. A
different configuration has shown me that this will achieve the
required outcome, the tricky part now is just getting that first
request to route. I know several ways to make Kamailio send to the
router, but the router is not behaving as I expect when I preload a
route set (with Route: headers).
Recognising that this is probably more of a Cisco problem than
Kamailio, can anyone confirm whether a Cisco router implements
loose-routing when receiving messages, or only when sending?
Regards,
Dave.
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Alex Balashov - Principal
Evariste Systems LLC
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