[OpenSIPS-Users] Topology Hiding Presence Proxy

[Bogdan-Andrei Iancu]

Hi Nate,

I missed this update from you - you did what I just asked in my last 
email :).

Could you share (off-line if needed) the pcap for SUBSCRIBE+NOTIFY and 
the opensips logs in debug level ?

Regards,

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

On 11/20/2017 08:57 PM, Nathan Baker wrote:
> I just wanted to follow up on this one more time with some additional 
> details.  In the topology hiding tutorial 
> (http://www.opensips.org/Documentation/Tutorials-Topology-Hiding) it 
> mentions that presence dialogs should be supported on top of the TM 
> module:
>
>     "When running strictly on top of the TM module, the topology
>     hiding SIP messages will be bigger when compared to the initial
>     requests ( since OpenSIPS will encode all the needed information
>     in a parameter of the Contact header ), but all type of SIP
>     requests and dialogs will be supported ( INVITE dialogs, Presence
>     dialogs, SIP MESSAGE, etc )."
>
>
> When I attempt to do this, the SUBSCRIBE works fine, but when the 
> NOTIFY comes back from the server I get errors when it does the 
> topology_hiding_match(), usually something like:
>
> ERROR:core:parse_params: invalid character, ; expected, found o
> ERROR:core:do_parse_rr_body: failed to parse params
> ERROR:core:do_parse_rr_body: failed to parse RR headers
> ERROR:topology_hiding:topo_no_dlg_seq_handling: failed parsing route set
>
> I can see the th_contact_encode_param value in the request URI, but 
> there is no route set in the NOTIFY message.  Is it expecting that 
> there is one?  I guess I need to turn on debugging or dig into the 
> topology hiding module code to see what's causing the errors.  Any 
> help would be greatly appreciated!
>
> Thanks,
> Nate
>
>
> On Fri, Nov 17, 2017 at 8:57 AM, Nathan Baker <bakern at gmail.com 
> <mailto:bakern at gmail.com>> wrote:
>
>     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.
>
>     Thanks,
>     Nate
>
>
>     On Nov 17, 2017 4:28 AM, "Bogdan-Andrei Iancu"
>     <bogdan at opensips.org <mailto: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 ?
>
>         Regards,
>
>         Bogdan-Andrei Iancu
>            OpenSIPS Founder and Developer
>            http://www.opensips-solutions.com
>         <http://www.opensips-solutions.com>
>
>         On 11/17/2017 08:13 AM, Nathan Baker wrote:
>>         Hello,
>>
>>         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!
>>
>>         Thanks,
>>         Nate
>>
>>
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>
>
>

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