[OpenSER-Users] presence caching and retrieval

[Sigrid Thijs]

Hi,

I was wondering, when a SIP user publishes his presence to the openser 
presence module, is this presence data cached in memory by the server or 
is this immediately stored in the database?

Is this somehow configurable?

If the presence data is cached in memory, is there an interface 
available for an external server to query the presence of one or more 
resources?

In particular, we are looking for a performant way to query the presence 
of multiple users (for example 20). We would like to avoid the overhead 
of creating a SIP subscription for each resource:
- to avoid traffic overhead
- we only need to know the current presence of the resource(s) and are 
not interested in future presence changes.

Do you have any suggestions on if/how this can be achieved with openser?

kind regards,

Sigrid Thijs