[SR-Users] how to achive destination number based routing before falling back to dispatcher-module

[Alex Balashov]

Hi,

If you are looking for a simple packaged solution that already 
incorporates a database table, then the `alias_db` module is your best bet:

https://kamailio.org/docs/modules/5.3.x/modules/alias_db.html

The number can be translated to a SIP Request URI domain via 
alias_db_lookup(), and that domain will of course be consumed when you 
forward the request, absent other next-hop overrides.

If alias_db_lookup() returns false, then you can fall back to a 
dispatcher election.

The major downside of this approach is that if your intent is to divert 
only a small amount of numbers out of your load balancer, this, as all 
other database-bound approaches, incurs an unnecessary database lookup 
for every single call. However, this is not a significant factor in most 
cases. It deserves some attention for very high CPS (Calls Per Second) 
operators, though.

-- Alex

On 7/23/20 9:01 AM, Christoph Russow wrote:
> Hi all,
> 
> im fairly new to Kamailio and currently setting up our new sip-server 
> systems so, hello everyone!
> 
> right now i have a Kamailio SBC which routes all calls using the 
> dispatcher module to our internally setup application servers (freeswitch).
> 
> i just got the idea that we might want specific routing based on 
> destination phone number in addition to simple loadbalancing.
> 
> can anyone point me in the right direction where i should look for 
> something i can place before the dispatcher routing to route calls based 
> on some entries in a database like destination number XYZ goes to server 
> A, number ABC goes to server Z and so on.
> 
> Or is there a way to select the dispatcher group id from the database 
> based on destination number?
> 
> best regards
> Christoph
> 
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-- 
Alex Balashov | Principal | Evariste Systems LLC

Tel: +1-706-510-6800 / +1-800-250-5920 (toll-free)
Web: http://www.evaristesys.com/, http://www.csrpswitch.com/