Hi all,

im currently trying to add a Outbound Proxying to our system which right
now does inbound loadbalancing for our application servers.

Current:
Inbound SIP Trunk -> Kamailio -> dispatcher -> ApplicationServer 1..n

i now want to add the ability for our internal Application Servers to
terminate their outbound calls through the kamailio system.

currently i've setup a gateway in the (freeswitch) application server
that has the kamailio system set as outbound-proxy. this leads to sip
calls started with

originate sofia/gateway/kamailio/<number>@<outbound carrier IP>

to be sent to the kamailio system which then forwards it to the given
carrier IP. Sadly our main carrier answers with "503 service unavailable
- no bandwith available". (maybe due to the internal ip-addresses within
some of the headers?)

i've attached our current kamailio configuration and also a pcap of a
call i tried to start with our main carrier.

i tried this way as it seemed to be the easiest way so our application
servers still can select the outbound carrier within their flow.

maybe i'm on the wrong way here and need to solve this problem in a
completely different way i don't know.

TLDR: sip proxying does not work as expected. need a way to achieve
outbound calls routed through kamailio from internal application servers

any hint/help into the right direction is appreciated

Best Regards
Christoph Russow

--
________________________________________________________________

EMTEX GmbH
Christoph Russow
Software Engineer

Bischof-Otto-Weg 9
D-91086 Aurachtal
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Tel. +49 9132 7490 0      Sitz der Gesellschaft: 91086 Aurachtal
Fax. +49 9132 7490 900    Amtsgericht Fürth:     HRB6804
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