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TS 24.228
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§7.2.4
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§7.3.5
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§7.4.3
P-Access-Network-Info
: the UE provides the access-type and access-info, related to the serving access network.
To
: a tag is added to the To header.
Contact
: contains a SIP URI with the IP address or FQDN of the UE; it includes the comp=sigcomp parameter.
SDP
: the SDP contains the set of codecs supported by UE; it requests a confirmation of the QoS preconditions for establishing the session.