Yealink SIP-T54S Administrator's Manual page 988

Administrator's Guide for SIP-T2 Series/T19(P) E2/T4 Series/T5 Series/CP860/CP920 IP Phones
sip.request_validation.digest.event
Description:
Configures which events specified within the Event header of SUBSCRIBE or NOTIFY request
should be validated when performing the digest authentication.
If it is left blank, all events will be validated.
Web User Interface:
None
Phone User Interface:
None
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Parameters Permitted Values
A valid string
Default
Blank