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BLF to mintor multple extensions
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Lucia_Yealink Offline
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Post: #2
RE: BLF to mintor multple extensions
(09-03-2016 03:54 PM)vipconsult Wrote:  I have just deployed 7 x T21P and trying to set them so that the BLF monitors more than one extension.

The option in Phone features has a Group call pickup and BLF , but no field to enter the extensions to monitor.

Can you please give me some pointer if this can be done in the phones or need to set something in the PBX ? (it is asterisk)

Hi Sir,

From your description, you want to monitor more than one extension.

BLF is used to monitor a specific user for status changes on IP phones. When the IP phone is configured to monitor a specific user, it sends a SUBSCRIBE message to the server. A NOTIFY message which includes XML in the message body is sent to the IP phone to inform the current state of monitored user. Once status of the monitored user is changed from idle to busy or vice versa, the IP phone is notified from the server with a NOTIFY message.


1. Since the T21 only have two line key, if you want to monitor two extensions, then you can configure the BLF feature like below. Please go to the Web UI of the phone, go to DSSKey->Line Key, choose the feature you want to use in the Type, and then fill in the extensions you want to monitor in the Value, click Confirm to save the configure.

2. If you want to monitor more than two extensions, than it should be supported by the server. For example, you can configure an extension list in the server side, and named it as 1234, then you can input the list name(1234) in the Value, and then the phone can subscribe to value 1234, and receive notifications of the status of 1234 .
Once one of the extensions has changed the status, the server should send the NOTIFY message to inform the phone that the status of 1234 is changed then the phone will change the status accordingly.

For more information, please refer to the User guide in the link below:
Yealink_SIP-T21P & SIP-T21_User_Guide_V72_1.pdf

Any question, please let me know.

Best Regards
--------------------------------------
Lucia Lu


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09-06-2016 03:01 PM
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RE: BLF to mintor multple extensions - Lucia_Yealink - 09-06-2016 03:01 PM

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