My question is quite close to this, what parameter should I change in BP250 to get original A subcsriber number show to C subscriber when external diversion is on? Operator informed that in they side it is possible and line PRI.
You should have network service activated (in AU is called Partial rerouting) from your ISDN provider. Then, activate 1972 on ISDN BRA or PRA. Whole idea is that network will send inquiry on incoming call to check if user is diverted externally before call goes thru. If yes, it will ask for destination. Once received, will connect call to that number (without using any B channel) and will send A number as CID.
BR
Thanks to zoo1, finally ISDN provider believed me and checked if they have PaRe on... and quess what happened Another company has tried to solve this problem over year ago and they gave up with provider because provider told that function is OK from their side.
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