Yealink T21PE2 - Page 66

Administrator’s Guide for SIP-T2 Series/T4 Series/T5 Series/CP920 IP Phones
60
Note: It works only if “static.managementserver.periodic_inform_enable” is set to 1 (Enabled).
Permitted
Values
Integer from 5 to 4294967295
Default 60
Web UI Settings->TR069->Periodic Inform Interval (seconds)