[SR-Users] default kamailio configuration.

[Vitaliy Aleksandrov]

I have lost in Route and Record-Route headers.
But now it's clear for me.  Huge thanks.
>
> On 25.06.2012 14:44, Vitaliy Aleksandrov wrote:
>> Hi All,
>>
>> After reading default kamailio configuration i can't understand why does
>> kamailio remove preloaded route headers from the incoming initial INVITE
>> before calling record_route().
>>
>> remove_hf("Route");
>> if  (is_method("INVITE|SUBSCRIBE"))
>>          record_route();
>
> Pre-loaded route sets can be used to abuse the proxy as an open relay. 
> This is bad. If a request hits my proxy, then I want to define how the 
> message is routed, and I do not want to route the message like 
> somebody else wants it.
>>
>> What will happen if an INVITE comes from another SIP proxy which wants
>> to stay in the middle of the dialogue ?
>
> Only "Route" headers are removed, not "Record-Route" headers which 
> create the route-set.
>
>> For example, during Re-INVITE UA from our local site will construct
>> in-dialog INVITE with R-URI taken from the remote contact and send it to
>> our local proxy according to RR. Local proxy will process it in
>> route[WITHNDLG] where loose_route() function will remove top most RR
>> header because it points to us and since there is no more RR records
>> forward the request to a destination from the R-URI.  As i understand in
>> that case remote proxy will not receive any in-dialog requests from us.
>
> Sure it does. As only the pre-loaded route is remove, not the 
> Record-Route headers. Thus, the in-dialog route set is not affected, 
> only the out-of-dialog route set (pre-loaded) is manipulated.
>
> regards
> Klaus
>
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