User's Manual

6xx Response—Global responses
6xx Response Send Receive Comments
600 Busy
Everywhere
Yes Yes
The IP Deskphone can send this
response when the IGNORE
setting is configured to
NETWORK, and the user chooses
to ignore an incoming call. When
received, this response falls
through the default handling.
603 Decline Yes Yes
The IP Deskphone can send this
response when the user declines
an incoming call. An optional
reason can be supplied.
604 Does Not Exist
Anywhere
No Yes See default handling.
606 Not Acceptable No Yes See default handling.
Default error handling
All 4xx/5xx/6xx responses (with the exception of 401/407) received by the IP Deskphone when
attempting to initiate a call result in the display of an error on the screen, and typically results
in fast or regular busy tone.
If a media negotiation fails during dialog setup, the IP Deskphone terminates the dialog.
If an in-dialog failure occurs during media (re)negotiation, the IP Deskphone falls back to
previously negotiated media settings. When a failure occurs that makes this impossible, the
IP Deskphone attempts to clear the call by terminating the dialog.
SIP header fields
The following table contains the supported SIP headers.
Header field Supported?
Accept Yes
6xx Response—Global responses
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