[OpenSIPS-Users] Topology Hiding Presence Proxy

Nathan Baker bakern at gmail.com
Fri Nov 17 08:57:21 EST 2017

Hi Bogdan,

Yes, I think that's correct, although I didn't see any module that would
implement a mid-presence agent.  I don't so much need to hide IPs, but I do
need to change the Contact header, so I started using topology_hiding for
that since it has it built in.  I originally tried to use mid_registrar but
stopped for now because it doesn't store locations in the database and
doesn't support presence (yet).  Any insight or suggestions would be
greatly appreciated, I would basically be fine with a B2BUA if there was
one that did forward registrations and presence.


On Nov 17, 2017 4:28 AM, "Bogdan-Andrei Iancu" <bogdan at opensips.org> wrote:

Hi Nathan,

Based on your description you do not want topology-hiding (to simply hide
IPs from the end-points), but a mid-presence agent, right ?


Bogdan-Andrei Iancu
  OpenSIPS Founder and Developer

On 11/17/2017 08:13 AM, Nathan Baker wrote:


I have been looking for some examples on how to use the topology hiding
module and proxying presence (SUBSCRIBE, NOTIFY, etc.) together, similar to
how the mid_registrar module would handle registrations.  Does anyone have
any examples or suggestions on how to do this?

I have the clients subscribing to the server (through OpenSIPS proxy to
another presence server), but I'm not sure how to store the subscriptions
and how to route the presence messages.  For registrations you can just do
save("location"), but is there an equivalent for subscriptions/presence?
It seems like the handle_subscribe() function from the presence module
wouldn't apply because it's part of a presence server, or can you just use
it for storing subscriptions but never publish anything?  I don't see a
function to look up these stored subscriptions.

Would it be better to just assume that the subscriptions are valid and
relay the messages?  If so, what is the best way to handle the routing?

Any help or insight would be greatly appreciated!


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