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3.5.4.2.3.1 SIP Response Codes

The following table specifies additional failure response codes that are defined for the SIP INFO request.

SIP response code

Reason

503

Service unavailable. One or more services required to execute the command are currently unavailable. This is a retriable failure.

603

Non-retriable command-specific failure. This is also used if the command specified an MCU-Type that is not enabled for the conference.