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.
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