Administrator’s Guide for SIP-T2 Series/T4 Series/T5 Series IP Phones
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X is the account ID. For T54S/T48S/T48G/T46S/T46G/T29G, X=1-16; for T52S/T42G/T42S, X=1-12; for
T41P/T41S/T27P/T27G, X=1-6; for T40P/T40G/T23P/T23G, X=1-3; for T21(P) E2, X=1-2; for T19(P) E2, X=1.
Bridge Lines Appearance (BLA)
BLA allows users to share a SIP line on two or more IP phones. Users can monitor the specific extension
(BLA number) for status changes on each IP phone. To use this feature, a BLA group should be
pre-configured on the server and one of them is specified as a BLA number.
Yealink IP phones support BLA using a SUBSCRIBE/NOTIFY mechanism as specified in RFC 3265. The
event used is: “dialog” for bridged line appearance subscribe and notify.
Topic
BLA Configuration
BLA Configuration
The following table lists the parameters you can use to configure BLA.
It configures the registration line type.
0-Disabled
1-Shared Call Appearance
3-Draft BLA
Account->Advanced->Shared Line
It configures the BLA number.
Example:
account.1.bla_number = 14084588327
Note: It works only if “account.X.shared_line” is set to 3 (Draft BLA).
String within 99 characters
Account->Advanced->BLA Number
account.X.bla.notify_with_expire.enable
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It enables or disables the IP phone to add the Expires attribute to the
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