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The

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 as a P-CSCF supports S-CSCF restoration procedures as defined in 3GPP TS 23.380.  If the

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 as a P-CSCF does not receive any response to a SIP request, sent to the IMS core or if the next hop is blacklisted by the

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’s Address Reachability Service (ARS), it rejects the request with a 504 (Server Time-out) response. The

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 uses its path header as P-Asserted-Id header in the response message. The error response also carries MIME body type "application/3gpp-ims+xml" with the following content:

...

For

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 configuration details, seerefer to:

• Common IP Attributes - SIP - CLI
• Common Ip IP Attributes - Flags (EMA)

For PSX-related information, refer to the PSX documentation.

 

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