[OpenSIPS-Users] Equal priority and weight SRV authentication

[Bogdan-Andrei Iancu]

Hello Chris,

The INVITE (2) is not a re-INVITE, but an initial INVITE - it does not 
belong to the same dialog as INVITE (1).

Considering that they are 2 different initial requests, based on DNS 
lookup, it is impossible to force their routing to the same back server 
(at least not based on SIP signalling).

A solution may be:
     - when the 407 is send back to uac, opensips makes an short entry 
(10 secs lifetime) in localcache, remembering the mapping between the 
auth nonce and the server which generated it.
     - when opensips receives an INVITE with credential, you check in 
localcache for the mapping with received nonce -> you will know where to 
send it (the server).

So you actually do DNS only for the INVITEs without credentials.

Best regards,

Bogdan-Andrei Iancu
OpenSIPS Founder and Developer
http://www.opensips-solutions.com


On 04/21/2013 11:26 AM, Chris Maciejewski wrote:
> Hi,
>
> I have a scenario where OpenSIPS relays proxy authentication to PSTN
> gateway which uses SRV records of equal priority and weight. Example
> SIP diagram can be found below:
>
> https://dl.dropboxusercontent.com/u/3182365/OpenSIPS-SRV-Auth.pdf
>
> Would it be possible to make OpenSIPS send Re-INVITE marked as (2) in
> diagram above to the same host where initial INVITE was sent?
>
> Kind regards,
> Chris
>
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