MAybe you could implement it with resource lists (RLS module subscribes to domain B if a lists in domain A is subscribed).

But above scenario does not reduce the traffic, as for every subscription to A, a subscription to B is done. This is necessary, as usually you have authorization at B to verify if the the user is allowed to subscribe a resource at B.

regards
Klaus

On 22.10.2013 16:24, Jan Gaida wrote:

Hello

I'd like to explain my scenario and the module I'd like to develop. I am
hoping for comments whether there are already modules like that or which
modules' API I could use to make the development easier.

Scenario:
I have two domains (A and B) with a Kamailio server in each of them
configured as presence servers.  The agents from both domains want to
subscribe to few resources from domain A.

Idea:
In order to reduce traffic between the domains, the presence server from
domain B shall handle the subscriptions internally and use an internal
virtual presence-user-agent to subscribe to the resources in domain A.

SIP Messages:

Subscription:
1) Subscribe resource.domain.a, from each user agent ua_n.domain.b
2) 202 OK from kamailio.domain.b
3) If not already subscribed, Subscribe resource.domain.a from
kamailio.domain.b with virtual user-agent
4) 202 OK from kamailio.domain.a

(Repeat for each susbcriber)
(Subscription has to be refreshed by an internal timer)
Events:
1) Publish resouce.domain.a to kamailio.domain.a
2) 200 OK from kamailio.domain.a
3) Notify resource.domain.a to kamailio.domain.b
4) 200 OK from kamailio.domain.b
5) Notify resource.domain.a to each user agent ua_n.domain.b
6) 200 OK from each ua_n.domain.b

(Internally, Kamailio of domain B has to forward the incoming Notify to
all locally subscribed user-agents)

I tried using the PUA module but it does not fit all my needs. Now I
think I will have to develop my own module in order to achieve
everything.  Any ideas?

Kind regards

--

*Jan **Gaida*
Ingeniero Desarrollo Software  

C/ Marconi 3 (PTM)
28760 Tres Cantos
Spain

jan.gaida@grupoamper.com <mailto:jan.gaida@grupoamper.com> |
www.grupoamper.com <http://www.grupoamper.com>  




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