3GPP TS 24.228 -- IMS Signalling flows for session initiation: Non Hiding
CS-O / S-S#2 / MT#2 (page 2 of 3)
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CS Network originated Session routed towards IM CN subsystem, through MGCF
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Single Network Operator performing Origination and Termination
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Mobile Termination, located in home network
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MGCF sends a PRACK request without SDP, because there is not another set of codecs to the original
SDP offer.
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Via:
Takes the value of either the IP address or FQDN of the originating MGCF.
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Cseq:
Takes a higher value than that in the previous request.
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In case the IAM had contained a continuity indication, the COT message arrives to the MGCF.
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When the resource reservation is completed and the possible COT message is received, MGCF sends
the UPDATE request to the terminating endpoint.
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The SDP indicates that the resource reservation was successful in the local segment.
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The SDP indicates that the resource reservation was successful both in the local and the remote segment.
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