[OpenSER-Users] Problem PUA_USRLOC, Presence acc. REGISTER/INVITE

[Anca Vamanu]

Hello,

Indeed pua_usrloc reacts only to Register message.
There are a lot of possibilities add that functionality for Invite and 
Bye. In short, you need to:
-  first  parse the Invite or Bye message to extract the destination and 
the source of the call
-  then,  get from database table 'presentity' used by the presence 
server, the current E-TAG value used for the publications for the 
respective user
- and finally construct the PUBLISH message and send it to the presence 
server

Of course that one option is to write a module for OpenSER. It is in 
fact quite easy, probably the easiest way. The module will use as a 
engine the 'pua' module, as all pua_* modules use. The pua module 
exports a function 'send_publish' that receives as a parameter a 
structure with the necessary informations. It also stores all the 
current E-TAGS locally, so there is no need to worry about that either 
and to query a remote database. Then, you can use the functions from 
core to parse the INVITE message and extract info. You can use as an 
example the pua modules for linkage with pua module, my recommendation 
is pua_mi because it is the simplest.

regards,
Anca


Schumann Sebastian wrote:
> Dear all
>  
> I have a problem, which I thought I can solve with PUA_USRLOC. I have 
> a OpenSER SIP Proxy and want him to create presence information about 
> the messages that pass him.
>  
> Some examples:
> - REGISTER: Publish as online/available
> - REGISTER+Expires=0: Publish as offline
> - INVITE/200 OK: Publish as busy
> - BYE: Publish as available again.
>  
> PUA_USRLOC seems to me can handle only simple on/offline according 
> registration state, that is saved on the server. As I have only a 
> proxy server and messages just pass by, this solution seems not the best.
>  
> What would you recommend me to solve the problem? Change the module, 
> add a module? As I don't have that much of experience in that area I 
> was thinking about using perl module and trigger some perl functions 
> that parse the messages that pass the proxy and make perl send the 
> PUBLISHes to the presence server.
>  
> Maybe some of you have other ideas or suggestions about that.... I 
> would be happy if you share them with me.
>  
> Best regards
> Sebastian
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