AudioCodes MEDIAPACK VERSION 6.2 - Manual (Page 126)

SIP Release Notes 126 Document #: LTRT-26901
CPE SIP Products
2.1.2.5.5 5xx Response – Server Failure Responses
Table 2-10: Supported 5xx SIP Responses
5xx Response Comments
500 Internal Server Error
Upon receipt of any of these Responses, the
device releases the call, sending an appropriate
release cause to the PSTN side.
The device generates a 5xx response according
to the PSTN release cause coming from the
PSTN.
501 Not Implemented
502 Bad gateway
503 Service Unavailable
504 Gateway Timeout
505 Version Not Supported
2.1.2.5.6 6xx Response – Global Responses
Table 2-11: Supported 6xx SIP Responses
6xx Response Comments
600 Busy Everywhere
Upon receipt of any of these Responses, the
device releases the call, sending an appropriate
release cause to the PSTN side.
603 Decline
604 Does Not Exist Anywhere
606 Not Acceptable