This callback in pjsua should give you everything that you need in terms of
presence info.
BR
Johan
/**
* Notify application when the state of client subscription session
* associated with a buddy has changed. Application may use this
* callback to retrieve more detailed information about the state
* changed event.
*
* @param buddy_id The buddy id.
* @param sub Event subscription session.
* @param event The event which triggers state change event.
*/
void (*on_buddy_evsub_state)(pjsua_buddy_id buddy_id,
pjsip_evsub *sub,
pjsip_event *event);
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