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Old 06-17-2021, 10:43 AM
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Try enabling SA8983 (replace CPN when calls forwarded off-net). A new field on p2 of the ISDN trunk group will appear called "CPN to Send for Redirected Calls". When this field is set to "calling", the CPN of the originating caller is sent on forwarded/redirected calls. The customer's service provider is disallowing this. When this field is set to "redirected", the CPN of the station performing the off-net forward is sent as administered in the public numbering table. Use "redirected" in this case. The mobile device will not receive the originating CPN, but at least the call will complete.

Quote:
This Special Application SA8983 modifies the calling party number for outgoing ISDN trunk calls that are the result of either call forwarding to an external number or the EC500 feature. With this feature active, the calling party number for these calls will be that of the call forwarding or EC500 station rather than that of the call originator. This feature works for both station-to-station and for incoming trunk calls to the call forwarding or EC500 station. All types of call forwarding–unconditional, busy/don’t answer, and enhanced call forwarding–are supported.
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