User's Manual

4xx Response Send Receive Comments
485 Ambiguous No Yes
See Default error handling on
page 217
. The IP Deskphone
does not attempt to retry the
request.
486 Busy Here Yes Yes
The IP Deskphone can respond
with this if the user is on the
IP Deskphone, and the
IP Deskphone has reached its
maximum number of allowed calls
and cannot present the incoming
call to the user. When this
message is received by the
IP Deskphone an error is displayed
and a busy tone is played.
487 Request
Canceled
Yes Yes See default handling.
488 Not Acceptable Yes Yes
The response is used by the
IP Deskphone when a failed media
negotiation occurs.
491 Request
Pending
Yes Yes
The IP Deskphone sends and
receive this message in GLARE
conditions.
5xx Response—Server failure responses
5xx Response Send Receive Comments
500 Internal Server
Error
Yes Yes
The IP Deskphone can send this
response when a request is
received but the IP Deskphone
software
is not in a correct state to
handle it. When receiving this
message, the IP Deskphone
displays an error for the user.
501 Not
Implemented
No Yes
See
Default error handling on
page 217
.
502 Bad Gateway No Yes
See
Default error handling on
page 217
.
503 Service
Unavailable
Yes Yes
SIP messages supported by the IP Deskphone
216 SIP Software for Avaya 1200 Series IP Deskphones-Administration September 2013
Comments? [e-mail]