I am trying to add a Gamma SIP trunk to a customers 470, the SIP works fine for i/c and o/g calls and is used solely as backup for their ISDN tunks. If they dial out on the ISDN they wish to send outgoing CLI XXXXXX (bt are providing 6 digits) and this works fine. If they failover to the SIP Trunk the wish to send 0113 YYY YYYY.
Whatever combination of setting i use I cannot acheive this.
CLI flexibility is enabled on the SIP