Ok so a bit of an update, we will be moving our sip trunks to interface with the SBC and then using it to route between the NEC, SIP and Teams! Seems to me we are just bolting the NEC onto a teams, SBC, SIP arrangement! it was proposed to me that the SV9100 would be the controlling party in this but it begins to seem otherwise.
I am beginning to question the benefit in doing this!