SIP (see RFC 2543) was initially standardized by the Multiparty Multimedia Session Management (mmusic) (see /html.charters/ ) working group within the IETF Transport area. Because the work had grown, a specialised SIP working group was created (see /html.charters/ ).

This header is used to convey charging related information, such as the globally unique IMS charging identifier (ICID) worth. A proxy COULD embrace this header, if not already present, in either the initial request or response for a dialog, or in the request and response of a standalone transaction outside a dialog. Just one instance of the header SHOULD be current in a selected request or response.

SRI (Ship Routing information) As an choice, the gsmSCF may decide the MSRN of the served subscriber by sending the SendRoutingInfo operation (including the gsmSCF Initiated Name parameter) to HLR. In the HLR this is handled in an analogous method as an SRI from … Read the rest