[Freeswitch-users] How to limit the number of incoming+outgoing calls via specific gateway?

My SIP provider allows only one call (incoming or outgoing) via one SIP account. For FreeSWITCH I have configured it as public DID extension and outgoing gateway. Now I would like to transfer to another gw (or generate "limit exceded") when one tries to place an outgoing call while incoming call is in progress. How tho do that? Limiting the number of outgoing calls is easy (mod_limit), but how to take into account incoming one? - Dmitry Bely