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2.2.18 P-Dialog-Recovery-Action Header Field Syntax

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This section follows the product behavior described in endnote <12>.

This protocol defines a P-Dialog-Recovery-Action header field. This header can be added by the SIP proxy to a 430 Flow Failed response.

The ABNF, as defined in [RFC5234], for the P-Dialog-Recovery-Action header field is as follows:

P-Dialog-Recovery-Action = "P-Dialog-Recovery-Action" HCOLON 
                             pdr-action *(COMMA pdr-action)
pdr-action               = "Registration-Route-Set-Update"
                           / "Dialog-Route-Set-Update"
                           / "Wait-For-Session-Update"
                           / pdr-action-extension
pdr-action-extension     = token

HCOLON is defined in [RFC3261] section 25. COMMA and token are defined in [RFC3261] section 25.1.