We have a CUCM Business edition ver 7.0
and srst ver 7 voice gateway with UCCX ver 5.0
In event of Business edition failing, we have got SRST configured on the Gateway.
Is there a way that I can configure the voice gateway to be able to use the UCCX.
Unfortunately it's not that simple as UCCX does not include H323 nor SIP protocols, so dial-peers can not be used.
UCCX uses JTAPI for call control for which you need either CallManager or CallManager Express.
Personally, I would consider using the B-ACD TCL script on the gateway. That way you can have resilience against UCCX failure as well (or even get rid of it completely :-)