A question about the second argument in onXXXEvent()
In a service logic, an INVITE request need to be handled, so an InviteEvent should be defined in sbb-jar.xml, and in the abstract sbb class, an onInviteEvent(RequestEvent event, ActivityContextInterface aci) method will be defined.
However, for JAIN SIP, a ClientTransaction or ServerTransaction is an Activity (defined in SIP RA), so we can get the activiy in two ways:
what is the difference?
If the first is chosen, what's the argument aci used for?