Mitel 6800 Series, Administrator'S Manual, Page: 476 / 1113

Mitel 6800 Series SIP Phone Release 4.2.0 SP2 Administrator Guide
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If you pick up a call on line 1 configured for BLA, and another call comes in on line 2, you can
pick up line 2 without putting line 1 on hold. The line 1 call will be on hold automatically; however
it is on hold locally only. The line 1 call cannot be shared with the BLA group.
BLA SUPPORT FOR THIRD-PARTY REGISTRATION
BLA allows an Address Of Record (AOR) to be assigned onto different line appearances for a
group of SIP user agents (IP phones). When a call is made to this BLA number, the call is
offered to all user agents that have mapping to this BLA. To support this, the IP phones need
to support third party registration for the BLA along with the registration for its own primary
appearance number. If the IP phone has the primary appearance as a BLA, then there is no
need for third party registration.
When configuring the BLA feature on a per-line basis for third party registration and subscription,
the third party name must be configured using the “
sip lineN bla number
” parameter. For third
party registration to work effectively, one of the lines should register as generic with its own
username.
For example, Bob has Alice’s appearance on his phone. Bob’s configuration is as follows:
#line 1 Bob
sip line1 auth name:4082272203
sip line1 password:
sip line1 mode: 0
sip line1 user name:4082272203
sip line1 display name:Bob
sip line1 screen name:Bob
#line 2 Alice
sip line2 auth name:4082272203
sip line2 password:
#BLA mode 3
sip line2 mode: 3
sip line2 user name:4082272203
#Alice phone number
sip line2 bla number:4085582868
sip line2 display name:Alice
sip line2 screen name:Alice
Alice’s configuration is as follows:
#line 1
sip line1 auth name:4085582868
sip line1 password:
Note:
The Hold button must be pressed for a call on a BLA line to be shared with the
BLA group.