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Relationship with HERFP (Heterogeneous Error Response Forking Problem ) draft-mahy-sipping-herfp-fix-01.txt
199 does not assume the UAC to send a new INVITE once it has been informed about the terminated dialog
Does not need to associate a ”new” INVITE with the ongoing INVITE transaction.
Proxy does not need to provide a URI pointing towards the UAS from where the non-2xx final response was received
No need to define a new DECLINE method
Applicable to all non-2xx responses
Only sent if an early dialog has been created

PPT Version