Bridged Line Appearance (Bla) - Mitel 6800 Series Administrator's Manual

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Mitel 6800 Series SIP Phone Release 4.2.0 SP2 Administrator Guide

BRIDGED LINE APPEARANCE (BLA)

A SIP bridge line appearance (BLA) on the IP phones allows multiple devices to share a single

directory address (DA).

For example, people working at a technical support department could be located in different

places. If their desktop phones are configured for BLA DA, when customer calls come in, all

the phones with the BLA DA would ring but the call can only be answered by one of them.

Once the call is answered, the rest of the phones reflect the status of the call. If the call was

put on "hold" by the original recipient, any one from the group can pick up the call.

Note: This feature is dependent on the IP telephony system to which the IP phone is

registered and according to draft-anil-sipping-bla-02.txt.

You can apply BLA on the IP phones as follows:

As a single BLA group - One BLA DA is shared among multiple phones. Only one phone

at a time can pick up an incoming call or initiate an outgoing call on the BLA DA. All phones

reflect the usage of the BLA DA. If the call is put on "hold", any one from the group can pick

up the "held" call.

As a multiple BLA group - On one single phone, multiple BLA DA can be associated with

different line appearances. Every BLA DA is independent from each other and follows the

same rules as "a single BLA group".

As multiple instances of a BLA DA - A "x-line-id" parameter was defined in draft-anil-sip-

ping-bla-02.txt

appearance instance. The parameter is carried in "Alert-Info" header field over the re-

quest-URI (INVITE e.g.) or in the NOTIFY messages to report the status of a dialog.

BLA DA can be configured on a global basis or on a per-line basis on the IP phones using the

Mitel Web UI or the configuration files.

The following table shows the number of lines that can be set to BLA for each model phone.

IP PHONE MODEL

CONFIGURING BLA

You can configure BLA on a global or per-line basis using the configuration files or the Mitel

to present the incoming call to or place an outgoing call on the specified line

POSSIBLE # OF BLA LINES

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