Avaya 1230 - Busy Lamp Field

The following is an example of a Speed Dial List file that must be loaded through provisioning.
[key]
label=S1
target=s1@avaya.com
retrieve=YES
mode=MidCallOnly
type=spdial
[key]
label=S2
retrieve=NO
mode=IdleOnly
subject=subject2
target=s2@avaya.com
type=spdial
[key]
label=S3
retrieve=NO
target=s3@avaya.com
type=spdial
Busy Lamp Field
The Busy Lamp Field (BLF) is an alternate presence-monitoring mechanism for the IP Deskphone
that allows presence functionality on proxies that support BLF.
BLF is an icon state for a corresponding Speed Dial key on an IP phone; the icon state tells you if
another extension connected to the same SIP server is busy. If configured, the IP Deskphone
subscribes to a resource list available on the server and receives information about other
extensions. BLF works through the SIP protocol by making use of SUBSCRIBE and NOTIFY
messages; the IP Deskphone is the subscriber and the SIP server is the notifier.
How it works
If you configure an IP Deskphone to monitor a list of zero or more extensions, it sends a
SUBSCRIBE SIP message to the server. A NOTIFY SIP message, which includes XML in the
message body, is sent to the subscriber to advise the subscriber of the current state of the
extension being monitored. Once the status of the monitored extension changes, the subscriber
receives a NOTIFY SIP message from the server. The subscriber must acknowledge the NOTIFY
SIP message by responding with a 200 OK SIP message.
Features
196 SIP Software for Avaya 1200 Series IP Deskphones-Administration March 2015
Comments? infodev@avaya.com