3.16.5.1 Server Behavior

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The server endpoint SHOULD send an Ms-Call-Info header set to "rgs.anonymization" if it provides anonymity, such as through a back-to-back agent.

Responses to new dialogs established by a user endpoint SHOULD contain an Ms-Call-Info header set to "rgs.anonymization" if the server endpoint provides anonymity, such as through a back-to-back agent.

If the server endpoint receives an INVITE with a P-Agent-On-Behalf-Of header, it SHOULD validate that the requestor, which is identified by the P-Asserted-Identity header, as specified in [RFC3325] section 9.1, has permission to make on-behalf-of requests. If the P-Asserted-Identity header is not present or the requestor does not have the required permission, the request SHOULD be declined with a 403 response.

If the request is valid, the server endpoint SHOULD proceed with the establishment of the call and, if the call is made anonymously, SHOULD add an Ms-Call-Info header set to "rgs.anonymization" in its response to the client endpoint.