Yealink T21PE2 - BLFBLF List Subscription; BLFBLF List Subscription Configuration

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Administrator’s Guide for SIP-T2 Series/T4 Series/T5 Series/CP920 IP Phones

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BLF/BLF List Subscription

Yealink IP phones support BLF using a SUBSCRIBE/NOTIFY mechanism as specified in RFC 3265.

BLF Subscription

When you configure the IP phone to monitor a specific line, the IP phone sends a SUBSCRIBE request with Request-URI

containing the monitor line URI to the server, and then receives a NOTIFY request. The NOTIFY message contains an

XML body with the status of the specific monitored line.

The following example shows a NOTIFY message for a BLF line “012”:

<?xml version="1.0"?>

<dialog-info xmlns="urn:ietf:params:xml:ns:dialog-info" version="1" state="full" entity="sip:012@10.20.10.42:5060">

<dialog id="0000"><state>terminated</state></dialog>

</dialog-info>

BLF List Subscription

When you configure the IP phone to monitor a list of specific remote lines, the IP phone sends a SUBSCRIBE request

with Request-URI containing the BLF List URI, and then receives a NOTIFY request. The NOTIFY message contains XML

body with the status of each monitor line.

The following example shows a NOTIFY message for a BLF List, the BLF List contains 4605 and 4607:

<?xml version="1.0" <?xml version="1.0"?>

<name>4605 Yealink</name>

</resource>

<name>4607 Yealink</name>

</resource>

</list>

Topic

BLF/BLF List Subscription Configuration

The following table lists the parameters you can use to configure BLF/BLF List subscription.

Parameter

account.X.blf.subscribe_period

[1]

<MAC>.cfg

Description

It configures the period (in seconds) of the BLF subscription.

The IP phone is able to successfully refresh the SUBSCRIBE before the SUBSCRIBE dialog expired.

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