[sr-dev] Adding support for Kamailio adding Path header

[Klaus Darilion]

On 08.08.2012 12:55, Iñaki Baz Castillo wrote:
> 2012/8/8 Iñaki Baz Castillo <ibc at aliax.net>
>>
>> Hi, AFAIK kamailio does not add Path header for a REGISTER that is routed to another server. Adding it should be straightforward:
>>
>> There is no need for a new script function. Instead use the existing loose_route() function, but:
>>
>> If the request method is REGISTER then add Path header(s) instead of Record-Route header(s), which the exact SAME value (this includes Outbound flow token and ;ob param, when implemented). No more.
>
>
> Ok, there is already support for this via:
>
>    http://kamailio.org/docs/modules/3.3.x/modules_k/path.html#id2537563
>
> I didn't realize of it. I expect that add_path() is just a wrapper on
> top of loose_route() by replacing "Record-Route" with "Path".

Not exactly. I takes care of choosing the proper IP address (outgoing 
interface) but does not add double-headers like RR does. Further, the 
add_path_received() function is useful for far-end NAT traversal.

regards
Klaus