I have a question relating to H.225 Annex G, section 1.8.2.28 (Usage Indication). The standard says the following about the SourceAddress field:

"SourceAddress E.164 or e-mail address of the caller party. In case of E.164 this designates the ANI/CLI."

i.e., if the SourceAddress is an E.164 number, this refers to the ANI/CLI of the caller.

Is this always true? Is AnnexG unnecessarily limiting the semantics of the SourceAddress field?

I can think of a case when the AnnexG definition might be a problem.

Think of a system where each subscriber in the system is assigned a globally unique "internet telephone number". In this case, the caller's identifier will look like an E.164 number, but it will not be the ANI/CLI. A border element or clearing house that assumes the E.164 is an ANI/CLI will be making a mistake.

Does anyone have any ideas how this scenario can be handled within the context of AnnexG?

Michael Fortinsky ----------------------------------------------------------------- Senior Program Manager, IP Telephony Group, VocalTec Communications Ltd. Email: mike@vocaltec.com Tel: 972 9 9707768 Fax: 972 9 9561867