2 sip accounts / one outgooing / in incoming

can i use 2 seperate sip accounts in jigasi?
one for incoming calls
one for outgoing calls


Not at the moment, sorry.

can i use 2 instances of jigasi?
both connected to one jitsi meet.

Yep, for the one for incoming calls actually does not need to be connected to anything.
Muc connection for the xmpp control room is only needed for outgoing calls.