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5.4.1.7 Notification of Application Servers about registration status

If the registration procedure described in subclauses 5.4.1.2, 5.4.1.4
or 5.4.1.5 (as appropriate) was successful, the SCSCF shall send a
third-party REGISTER request to each AS with the following information:

[...]

g) for initial registration and user-initiated reregistration (subclause
5.4.1.2), a message body, if there is Filter Criteria indicating the
need to include HSS provided data for the REGISTER event (e.g. HSS may
provide AS specific data to be included in the third-party REGISTER).

If there is a service information XML element provided in the HSS Filter
Criteria for an AS (see 3GPP TS 29.228 [14]), then the S-CSCF shall
include it in the message body of the REGISTER request within the
XML element as described in subclause 7.6.

For the messages including the IM CN subsystem XML body, the S-CSCF
shall set the value of the Content-
Type header to include the MIME type specified in subclause 7.6;

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