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Full Version: SIP-T27G no Refresh Display BLF Monitoring When Receiving subsequence Notify
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The Yealink IP Phone SIP-T27G does not refresh the Device Display when receiving most recently NOTIFY messages, on BLF feature.

Following show packet capture:

NOTIFY sip:5991@phoneipaddr:5060 SIP/2.0 <------ First Notify received
v: SIP/2.0/UDP asteriskserveripaddr:5060;branch=z9hG4bK3ceecd02
Max-Forwards: 70
f: <sip:202@asteriskserveripaddr>;tag=as75cd87a9
t: "User Name 2" <sip:5991@asteriskserveripaddr:5060>;tag=190612704
m: <sip:202@asteriskserveripaddr:5060>
i: 0_472292147@phoneipaddr
CSeq: 103 NOTIFY
User-Agent: Asterisk PBX
Subscription-State: active
o: dialog
c: application/dialog-info+xml
l: 558

<?xml version="1.0"?>
<dialog-info xmlns="urn:ietf:params:xml:ns:dialog-info" version="1" state="full" entity="sip:202@asteriskserveripaddr">
<dialog id="202" call-id="pickup-0_472292147@phoneipaddr" local-tag="190612704" remote-tag="as75cd87a9" direction="recipient">
<remote>
<identity display="202">sip:202@asteriskserveripaddr</identity>
<target uri="sip:202@asteriskserveripaddr"/>
</remote>
<local>
<identity display="202">sip:202@asteriskserveripaddr</identity>
<target uri="sip:202@asteriskserveripaddr"/>
</local>
<state>early</state>
</dialog>
</dialog-info>


SIP/2.0 200 OK
Via: SIP/2.0/UDP asteriskserveripaddr:5060;branch=z9hG4bK3ceecd02
From: <sip:202@asteriskserveripaddr>;tag=as75cd87a9
To: "User Name 2" <sip:5991@asteriskserveripaddr:5060>;tag=190612704
Call-ID: 0_472292147@phoneipaddr
CSeq: 103 NOTIFY
Contact: <sip:5991@phoneipaddr:5060>
User-Agent: Yealink SIP-T27G 69.84.0.10
Content-Length: 0


NOTIFY sip:5991@phoneipaddr:5060 SIP/2.0 <------ Second Notify received refresh one previous
v: SIP/2.0/UDP asteriskserveripaddr:5060;branch=z9hG4bK7cd1503c
Max-Forwards: 70
f: <sip:202@asteriskserveripaddr>;tag=as75cd87a9
t: "User Name 2" <sip:5991@asteriskserveripaddr:5060>;tag=190612704
m: <sip:202@asteriskserveripaddr:5060>
i: 0_472292147@phoneipaddr
CSeq: 104 NOTIFY
User-Agent: Asterisk PBX
Subscription-State: active
o: dialog
c: application/dialog-info+xml
l: 572

<?xml version="1.0"?>
<dialog-info xmlns="urn:ietf:params:xml:ns:dialog-info" version="2" state="full" entity="sip:202@asteriskserveripaddr">
<dialog id="202" call-id="pickup-0_472292147@phoneipaddr" local-tag="190612704" remote-tag="as75cd87a9" direction="recipient">
<remote>
<identity display="User Name Extern">sip:22225555@asteriskserveripaddr</identity>
<target uri="sip:22225555@asteriskserveripaddr"/>
</remote>
<local>
<identity display="User Name 1">sip:5988@asteriskserveripaddr</identity>
<target uri="sip:5988@asteriskserveripaddr"/>
</local>
<state>early</state>
</dialog>
</dialog-info>

Code:
[b]<----  In this point, when receiving, a IPhone1's visual screen on outhers devices of
<----  monitoring group must display visual screen 5988 <- 22225555, but it is not occur,
<----  but instead take place 202 <- 22225555[/b]

SIP/2.0 200 OK
Via: SIP/2.0/UDP asteriskserveripaddr:5060;branch=z9hG4bK7cd1503c
From: <sip:202@asteriskserveripaddr>;tag=as75cd87a9
To: "User Name 2" <sip:5991@asteriskserveripaddr:5060>;tag=190612704
Call-ID: 0_472292147@phoneipaddr
CSeq: 104 NOTIFY
Contact: <sip:5991@phoneipaddr:5060>
User-Agent: Yealink SIP-T27G 69.84.0.10
Content-Length: 0


NOTIFY sip:5991@phoneipaddr:5060 SIP/2.0 <------ last Notify received refresh state=terminated
v: SIP/2.0/UDP asteriskserveripaddr:5060;branch=z9hG4bK4ece7870
Max-Forwards: 70
f: <sip:202@asteriskserveripaddr>;tag=as75cd87a9
t: "User Name 2" <sip:5991@asteriskserveripaddr:5060>;tag=190612704
m: <sip:202@asteriskserveripaddr:5060>
i: 0_472292147@phoneipaddr
CSeq: 105 NOTIFY
User-Agent: Asterisk PBX
Subscription-State: active
o: dialog
c: application/dialog-info+xml
l: 210

<?xml version="1.0"?>
<dialog-info xmlns="urn:ietf:params:xml:ns:dialog-info" version="3" state="full" entity="sip:202@asteriskserveripaddr">
<dialog id="202">
<state>terminated</state>
</dialog>
</dialog-info>


SIP/2.0 200 OK
Via: SIP/2.0/UDP asteriskserveripaddr:5060;branch=z9hG4bK4ece7870
From: <sip:202@asteriskserveripaddr>;tag=as75cd87a9
To: "User Name 2" <sip:5991@asteriskserveripaddr:5060>;tag=190612704
Call-ID: 0_472292147@phoneipaddr
CSeq: 105 NOTIFY
Contact: <sip:5991@phoneipaddr:5060>
User-Agent: Yealink SIP-T27G 69.84.0.10
Content-Length: 0



Yealink's software engineering should correct this behavior, so that the device displays the correct group user information, as soon as possible.
This problem exists from the very beginning. I already wrote that Opnestage fulfills these events without problems and shows the correct data on the display.

http://forum.yealink.com/forum/showthread.php?tid=40767

Yealinkdid not even try to fix this problem. In general, as usual, the main thing to sell, and the rest do not care. The following phones will definitely not Yealink
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