Yealink SIP-T2 Series Administrator's Manual page 210

Administrator's Guide for SIP-T2 Series/T4 Series/T5 Series/CP920 IP Phones
the REGISTER message.
For example:
Contact: <sip:1012@10.2.20.160:5060>;+sip.instance="<urn:uuid:5acd54e8-f197-57e2-aa42-
5f4a5d04367c>"
Default 0
Parameter sip.reg_surge_prevention
Description It configures the waiting time (in seconds) for account register after startup.
Permitted
Integer from 0 to 60
Values
Default 0
Web UI Network->Advanced->Registration Random->Registration Random (0~60s)
Parameter account.X.subscribe_register
Description It enables or disables the IP phone to subscribe the registration state change notifications.
Permitted 0-Disabled
Values 1-Enabled
Default 0
Web UI Account->Advanced->Subscribe Register
phone_setting.disable_account_without_user-
Parameter
name.enable
Description It enables or disables the IP phone to disable the account whose username is empty.
Permitted 0-Disabled
Values 1-Enabled
Default 0
Parameter account.X.register_expires_overlap
Description It configures the renewal time (in seconds) away from the registration lease.
Permitted
Positive integer and -1
Values
Default -1
Parameter account.X.subscribe_expires_overlap
Description It configures the renewal time (in seconds) away from the subscription lease.
Permitted
Positive integer and -1
Values
Default -1
[1]
X is the account ID. For T54S/T48S/T48G/T46S/T46G/T29G, X=1-16; for T52S/T42G/T42S, X=1-12; for T41P/T41S/T27G,
X=1-6; for T40P/T40G/T23P/T23G, X=1-3; for T21(P) E2, X=1-2; for T19(P) E2/CP920, X=1.
[2]
If you change this parameter, the IP phone will reboot to make the change take effect.
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[1]
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<y0000000000xx>.cfg
<MAC>.cfg
<y0000000000xx>.cfg
<MAC>.cfg
<MAC>.cfg