@miconda I'm thinking if ``sca`` can be redesigned and integrate the subscription part of it as a module like ``presence_sca`` using ``presence`` infrastructure.
The thing is that ``presence`` has support for process only the body not for the headers and ``sca`` is adding ``Call-Info`` header to a bodyless ``NOTIFY`` reply.
Is it worth the trouble to implement that in ``presence`` or should I just keep hacking into ``sca`` directly?