T42S do not display icon in YealinkIPPhoneStatus line

[oliv]

Hello,

I registered a 66.84.0.15-enabled T42S to an Asterisk instance. This instance is configured to send SIP NOTIFY messages.

When receiving the bellow message, the T42S status displays text correctly but icon is missing (see page 56 in v83 XML Browser Developper Guide).
I tried with Message, Forward and DND icons.

Code:

NOTIFY sip:7005@192.168.64.174:5060 SIP/2.0
Via: SIP/2.0/UDP 192.168.64.250:5060;branch=z9hG4bK1afb4f4e;rport
Max-Forwards: 70
From: "asterisk" <sip:asterisk@192.168.64.250>;tag=as0acdc2c1
To: <sip:7005@192.168.64.174:5060>
Contact: <sip:asterisk@192.168.64.250:5060>
Call-ID: 5dd8a39f7b426b0b7228074d3870645e@192.168.64.250:5060
CSeq: 102 NOTIFY
User-Agent: Asterisk PBX 11.25.0
Date: Fri, 16 Aug 2019 12:03:48 GMT
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY, INFO, PUBLISH, MESSAGE
Supported: replaces, timer
Subscription-State: terminated
Event: Yealink-xml
Content-type: application/xml
Content-Length: 191

<?xml version="1.0" encoding="ISO-8859-1"?>
<YealinkIPPhoneStatus Beep="yes" SessionID="125" Timeout="0">
<Message Align="center" Icon="DND">Forward Fav</Message>
</YealinkIPPhoneStatus>

Can this be reproduced elsewhere ?
Did I miss something ?

Best regards