Download Report

No. 11-010
KX-UT133 and KX-UT136 BLF Button Specification
[ Symptom ]
The KX-UT133/136 unit may become sluggish / unresponsive when installed in a Group
Ring configuration with more than 6 BLF Buttons programmed on the unit.
[ Condition which this issue occurs ]
Number of BLF Settings
Environment
Over 6 BLF buttons per UT133/136
At the Group Ring operation, multiple SIP NOTIFY for
BLF is sent to SIP Phone.
[ Cause ]
The symptom above will occur when a SIP Server sends multiple “NOTIFY” for BLF to a
UT133/136 simultaneously.
If the SIP Server sends one “NOTIFY” for BLF containing the list for multiple BLF’s, this
symptom will not occur.
Symptom Occurs
UT13X Operation is Successful
KX-UT13X
SIP Server
NOTIFY (100)
NOTIFY (200)
BLF
setting is
100,200,
300
SIP Server
KX-UT13X
NOTIFY
BLF
setting is
100,200,
300
(100,200,300)
NOTIFY (300)
Panasonic has discovered that Asterisk and (Asterisk-based) SIP Service Providers may
send multiple “NOTIFY” for BLF to the SIP end-point for each individual BLF button
simultaneously.
Example:
Setting Condition:
Group Ring Call Number: 1000
Group Ring Extension Number: 100,200,300,400,500,600
Asterisk
KX-UT13X
Asterisk
Group Ring 1000
Call to 1000
INVITE (1000)
NOTIFY (100)
BLF
setting is
100,200,
300,400,
500,600
NOTIFY (200)
Ext100
Ext200
NOTIFY (300)
Ext300
Ext400
NOTIFY (400)
NOTIFY (500)
Ext500
Ext600
Takes longer
to process
due
to
insufficient
CPU
performance
NOTIFY (600)
at the same time
[ Solution ]
When installing KX-UT133/136 in a Group Ring configuration, check the SIP Server
specification or contact your SIP Service provider to confirm the “NOTIFY” for BLF method
used.
If multiple SIP “NOTIFY” for BLF are sent individually by the SIP Server or SIP Service
Provider, request to have this changed to one “NOTIFY” for BLF by list.
If SIP “NOTIFY” for BLF is sent individually and cannot be changed, reduce the number of
BLF Buttons programmed on the UT133/136 to a maximum of 6.
If more than 6 BLF buttons are needed, install the KX-UT248-B or KX-UT670-B for the
application.