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IMS
TS 24.228
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§7.2.4
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§7.3.5
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§7.4.3
Request-URI
: Contains the international E.164 number from the user, as obtained from CS Networks signalling.
Via
: Contains the IP address or FQDN of the originating MGCF.
P-Asserted-Identity
: The MGCF inserts the TEL URL containing the subscriber number, as received from the CS network.
P-Charging-Vector
: The MGCF inserts this header and populates the icid parameters with a globally unique value.
Contact
: SIP URI that contains the IP address or FQDN of the MGCF.
SDP
: Contains a preconfigured set of codecs supported by the MGW.