Sometimes, if there are too many BLF DSS Keys configured or an environment problem, the BLF status can't be updated in time due to mass notify message.
Phone may receive too much notify messages at the same time and can't deal with them in time.
1. Reduce the number of BLF DSS Keys. Generally, we don't recommend configured more than 100 BLF DSS Keys in a phone.
2. Change parameters“SIP Session Timer T1(0.5~10s) and “ SIP Session Timer T2 (2~40s) under Account->Advanced page , increase the value of T1 will make phone send less subscribe message when it doesn’t receive a notify message.
Note: In V80 version, the path of SIP Session Timer T1(0.5~10s) and SIP Session Timer T2 (2~40s) is Web interface->Settings->SIP.
Set T1 to 4s
Set T2 to 6s
Disable subscribe for MWI
3. Check the network environment and make sure that same NOTIFY message won't be resent multiple times by your network device.
T1 is an estimate of the Round Trip Time (RTT) of transactions between a SIP client and SIP server.
T2 represents the maximum retransmit interval for non-INVITE requests and INVITE responses
If there are any other questions, please feel free to contact with ticket.yealink.com
