Jerry,
Unfortunately there currently isn't a single answer to your question. There are at least three ways to provide this info:
- The From header is the simplest answer, and the one that is most likely to interoperate with everything. The problem with it is that, on its own, it is entirely the honor system. Any caller can claim to be anybody they want.
- The P-Asserted-Identity header is workable in a system that is designed to use that. There are limitations to this kind of system, but it is deployable today.
- The identity draft provides a way to certify the validity of the From header. It doesn't have the brittleness of the trust boundary that P-Asserted-Identity requires. But I don't think the details and implications are fully understood yet, and AFAIK it hasn't been implemented. Long term this seems quite promising.
Paul
Jerry Ipe Thomas wrote:
Hi All!
From a PSTN(FXO)<->VoIP Gateway, how do I tell the other party (IP/PSTN), who may or may not be within my administrative domain, that <this> is the *actual* number from which you're getting a call?
This applies for both calls from PSTN->VoIP (CID Detection) and VoIP->PSTN (CID Generation).
Warm Regards,
Jerry Ipe Thomas Engineer (R&D) D-Link India Ltd.
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