Re: [SR-Users] Loose Routing with Cisco router

Alex, Thanks. It's good to know that it should work. Daniel, It's a 2811 running IOS 12.4(25g). 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 On 14 Aug 2013, at 5:09 pm, sr-users-request(a)lists.sip-router.org wrote: > > > Message: 3 > Date: Wed, 14 Aug 2013 13:06:19 +0400 > From: Alex Balashov <abalashov(a)evaristesys.com> > To: miconda(a)gmail.com, "Kamailio (SER) - Users Mailing List" > <sr-users(a)lists.sip-router.org> > Subject: Re: [SR-Users] Loose Routing with Cisco router > Message-ID: <65a98f42-c370-49fe-91c4-d018b3d61249(a)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(a)gmail.com> wrote: >> Hello, >> >> what model the cisco router is? >> >> From what I understand, you want to go from: >> >> [a] ===> [kamailio] ===> [b] >> >> to: >> >> >> 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. >>> >>> >>> _______________________________________________ >>> SIP Express Router (SER) and Kamailio (OpenSER) - sr-users mailing >> list >>> sr-users(a)lists.sip-router.org >>> http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-users > > -- > Sent from my mobile, and thus lacking in the refinement one might expect from a fully fledged keyboard. > > Alex Balashov - Principal > Evariste Systems LLC > 235 E Ponce de Leon Ave > Suite 106 > Decatur, GA 30030 > United States > Tel: +1-678-954-0670 > Web: http://www.evaristesys.com/, http://www.alexbalashov.com > > >