[Serusers] Loose routing question

Martin Koenig martin.koenig at toplink-plannet.de
Fri May 6 11:20:49 CEST 2005


reticent wrote:

>Currently (in rel_0_9_) the "loose_route()" function will NOT match a
>message unless SER has some stateful information regarding that
>transaction in memory (my assumption has been that the information is
>created when the "record_route()" or "record_route_preset()" functions
>are used and is referenced by "loose_route()" according to the "tag=..."
>header field inside the "Route:" header), so simply adding a "Route:
>..." header into the sip message will not be loose_routed.
>  
>

Could a Developer please ACK / non-ACK this that Ser suddenly turned 
call stateful?

Regards,
Martin

>
>
>Michael Ulitskiy wrote:
>
>  
>
>>Hello,
>>
>>I'm trying to comprehend loose routing concept and I have
>>a question that concerns me.
>>As far as I understand loose routing says that if there're Route
>>headers in a message it should be forwarded according to the URIs
>>set in Route headers. 
>>I thought that this is true only within a dialog, but RFC3261 (part 16.6) says:
>>"Requests establishing a dialog may contain a preloaded Route header field."
>>Also SER manual says: " the failure not to include loose routing in your scripts 
>>may lead to infinite loops. Make sure that you include the following script 
>>fragment immediately after request sanity checks" and provide the following
>>piece of code:
>>if (loose_route()) {
>>       t_relay();
>>       break;
>>};
>>
>>which as far as I understand unconditionally forwards message if Route header
>>is present.
>>So I'm wondering what about security? If I follow this guidelines how I would
>>shield my PSTN gateway if anyone can construct message and 
>>pre-load it with URI of my gateway and all my proxies must honor it.
>>For example I have a PSTN gateway on ip address 10.1.1.5 and proxy
>>on 10.1.1.10 that supposed to interface outside world.
>>So I guess if someone construct a message like this:
>>
>>INVITE sip:12345 at somewhere.com SIP/2.0
>>...
>>Route: <sip:12345 at 10.1.1.5;lr>
>>
>>my proxy will forward it to PSTN gateway and it will make outbound call.
>>
>>Is this true? Please enlighten me on this.
>>Thank you,
>>
>>Michael
>>
>>_______________________________________________
>>Serusers mailing list
>>serusers at lists.iptel.org
>>http://lists.iptel.org/mailman/listinfo/serusers
>>
>>
>> 
>>
>>    
>>
>
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>




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