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Version 6.2 125 December 2010
SIP Release Notes 2. Supported Features
4xx Response Supported Comments
420 Bad Extension Yes The device doesn't generate this response. Upon receipt of
this message and before a 200 OK has been received, the
device responds with an ACK and disconnects the call.
423 Interval Too
Brief
Yes The device does not generate this response. On reception
of this message the device uses the value received in the
Min-Expires header as the registration time.
433 Anonymity
Disallowed
Yes If the device receives a 433 Anonymity Disallowed, it sends
a DISCONNECT message to the PSTN with a cause value
of 21 (Call Rejected). In addition, the device can be
configured, using the Release Reason Mapping, to generate
a 433 response when any cause is received from the PSTN
side.
480 Temporarily
Unavailable
Yes If the device receives a 480 Temporarily Unavailable
response, it notifies the User with a Reorder Tone.
This response is issued if there is no response from remote.
481 Call
Leg/Transaction
Does Not Exist
Yes The device doesn't generate this response. Upon receipt of
this message and before a 200 OK has been received, the
device responds with an ACK and disconnects the call.
482 Loop Detected Yes The device doesn't generate this response. Upon receipt of
this message and before a 200 OK has been received, the
device responds with an ACK and disconnects the call.
483 Too Many Hops Yes The device doesn't generate this response. Upon receipt of
this message and before a 200 OK has been received, the
device responds with an ACK and disconnects the call.
484 Address
Incomplete
Yes The device doesn't generate this response. Upon receipt of
this message and before a 200 OK has been received, the
device responds with an ACK and disconnects the call.
485 Ambiguous Yes The device doesn't generate this response. Upon receipt of
this message and before a 200 OK has been received, the
device responds with an ACK and disconnects the call.
486 Busy Here Yes The SIP device generates this response if the called party is
off-hook and the call cannot be presented as a call waiting
call. Upon receipt of this response, the device notifies the
User and generates a busy tone.
487 Request
Canceled
Yes This response indicates that the initial request is terminated
with a BYE or CANCEL request.
488 Not Acceptable Yes The device doesn't generate this response. Upon receipt of
this message and before a 200 OK has been received, the
device responds with an ACK and disconnects the call.
491 Request
Pending
Yes When acting as a UAS: the device sent a re-INVITE on an
established session and is still in progress. If it receives a
re-INVITE on the same dialog, it returns a 491 response to
the received INVITE.
When acting as a UAC: If the device receives a 491
response to a re-INVITE, it starts a timer. After the timer
expires, the UAC tries to send the re-INVITE again.