Mitel 6867i Premium, Administrator'S Manual

Page: 615 / 1042

Advanced Operational Features
6-37
“CALL-INFO” HEADER TO 200OK RESPONSES FOR SHARED CALL
APPEARANCE (SCA) LINES
A “Call-Info” header is included in the 200ok response to an INVITE, RE-INVITE, and UPDATE
messages for SCA lines. No configuration is required for this feature.
REASON HEADER FIELD IN SIP MESSAGE
The IP Phones support the receiving of the Reason Header Field in a SIP CANCEL message,
as described in RFC3326. This allows a call that is answered from somewhere else to still
display in the Received Callers List. Also, the missed calls indicator and counter do not change.
LIMITATION
If the call is answered somewhere else, the duration of the call does not display in the Received
Callers List.
CALL FAILED MESSAGE
Administrators can place certain restrictions on users for making outgoing calls (for example,
only allow national calls, only allow internal calls, only allow emergency calls, etc.). Previously
when a restriction was active and a user dialed a number that was not allowed, the PBX sent
a certain status code 4xx and the phone displayed “Call Failed” or “Busy”, which was not very
informative to the user.
Now when an outgoing call fails with a status code 4xx or 5xx, the phone will look for the Reason
Header (RFC 3326)
in the status message and display the Reason Header to the user. The
reason text is displayed in the center of the screen and is limited to 20 characters.
If
there is
a Reason Header in the status code message, the reason text (if any) will be displayed
on the phone. The tone that is played follows the status code (i.e. the busy tone for 486 and
the call failed tone for all others).
If
there is no
Reason Header in the status message, the behavior of the phone should be
unchanged:
• “Busy” is displayed for the status code 486 and the busy tone will be played,
• or “Call Failed” is displayed for status codes 4xx to 5xx and the call failed tone will be played,
• or “Not Configured” or “Seize Failed” is displayed in case of an internal error,
• or “Unavailable” is displayed in case of code less support (6867i, 6869i, 6873i).