Avaya 1230 Administration page 197

BLF is based on an Event Dialog package. Dialog refers to the SIP relationship that two SIP peers
establish. Dialogs can be created by many methods, although RFC 3261 defines only one: the
INVITE method. In other words, as soon as two SIP peers establish a new call/dialog, modify a call/
dialog, or cancel a call/dialog, the monitoring party receives notification about that event. For more
information, refer to RFC 4235.
Note:
Dialog Package (BLF) differs from Presence package. Refer to RFC3856 for more information
on Presence.
Use the command BLF_ENABLE to enable the BLF feature on an IP Deskphone. In order to use
BLF it must be activated, properly provisioned, and connected to the server that supports this
feature.. It is used whenever a speed dial key is provisioned on the IP Deskphone; an icon assigned
to the speed dial key reflects the new status of the monitored peer, which is extracted from a
NOTIFY message. You can configure speed dial keys for as many parties as you want to monitor;
the parties must exist on the configured Resource List Uniform Resource Identifier (URI).
Call states and corresponding Presence icons
corresponding icons.
Figure 22: Call states and corresponding Presence icons
Resource List URI
The SIP-specific event notification mechanism allows the subscriber to request to be notified of
changes in the state of a particular resource. Users often subscribe to multiple resources; without an
aggregating mechanism, the user would have to generate a SUBSCRIBE request for each resource
they monitor.
A resource list is identified by a URI, and it represents a list of zero or more URIs (SIP endpoints).
Each URI is an identifier for an individual resource to which the user can subscriber. The
configuration of URI is done on the server and an IP Deskphone requires only to be configured with
the desired Resource List URI; the URI can even be configured automatically if the server supports
auto-generation. For more information, refer to RFC 4662.
March 2015
on page 197 shows the various call states and
SIP Software for Avaya 1200 Series IP Deskphones-Administration
Comments? infodev@avaya.com
Busy Lamp Field
Figure 22:
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