Harneet,

More philosophically, it should be added that routing determinations based on the dialed number should never be done based on the To header, but only the Request URI.

— Alex

> On Apr 25, 2023, at 1:39 AM, Henning Westerholt <hw@gilawa.com> wrote:
>
> Hello,
>  you could just query any supported database e.g. with the sqlops module. The dialplan module might be also interesting, or htable if you prefer to have it in-memory (it also supports reading and caching from a DB).
>  Cheers,
>  Henning
>  From: harneet singh <hbilling@gmail.com>
> Sent: Montag, 24. April 2023 12:16
> To: Henning Westerholt <hw@gilawa.com>
> Cc: Kamailio (SER) - Users Mailing List <sr-users@lists.kamailio.org>
> Subject: Re: [SR-Users] Configuring dynamic Destination identification for Kamailio Routing
>  Thanks for the response Henning. I was wondering if we needed to do the routing based on the following logic:
>  * Based on the From and To Header, select the next hop.The mappings for these fields will be prefed in a db or some configuration file and that can be read at Kamailio startup.
>  Is such an option readily available in any of the existing modules?
>  Regards,
> Harneet Singh
>    On Thu, Apr 20, 2023 at 9:49 PM Henning Westerholt <hw@gilawa.com> wrote:
> Hello,
>  usually this kind of routing is done by using the dispatcher module. If you need to match on a certain key of the SIP message, there are other possibilities, like the lcr module for example. It supports regular expression match from a database, that can be reloaded without Kamailio restart.
>  Cheers,
>  Henning
>  From: harneet singh <hbilling@gmail.com>
> Sent: Donnerstag, 20. April 2023 14:48
> To: Kamailio (SER) - Users Mailing List <sr-users@lists.kamailio.org>
> Subject: [SR-Users] Configuring dynamic Destination identification for Kamailio Routing
> 
> Hi Experts,
>  We have been using Kamailio as a sip proxy for a fair bit of time now(version 5.3.2 though) and do understand the native routing mechanism that can be instrumented through the kamailio cfg scripts.
> We initially had only two sides, where the traffic could come from into Kamailio and it just passed through to the other side(ie Traffic from A was routed to B and that from B was routed to A). Off late, a few more sip elements have been introduced in the deployment and now there is a need for a more formal/robust mechanism to select the intended destination to forward an initial SIP INVITE to.
>  I believe that we could still keep all the logic in the native kamailio script and do the routing(for example, an incoming call where the From URI contains sip.elementA.com should be routed to destinationsip.elementB.com, where as if the To URI contains sip.elementC.com, the request should be routed tosip.elementC.com). Since we have many sip elements like A,B.C,D,E etc where the requests might have to be routed to, based on certain different criteria, this logic would become cumbersome. What would be the best way to accommodate this?  Would it be possible to rewire this routing logic at runtime(like in some csv file that can be reloaded) without a Kamailio restart?
>  Regards,
> Harneet Singh
>  --
> "Once you eliminate the impossible, whatever remains, no matter how improbable, must be the truth" - Sir Arthur Conan Doyle
>
>  -- "Once you eliminate the impossible, whatever remains, no matter how improbable, must be the truth" - Sir Arthur Conan Doyle
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--
Alex Balashov
Principal Consultant
Evariste Systems LLC
Web: https://evaristesys.com
Tel: +1-706-510-6800

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