Yealink SIP-T2XP Administrator's Manual page 330

Administrator's Guide for SIP-T2xP IP Phones
1-Enabled
If it is set to 1 (Enabled), the IP phone will send a SUBSCRIBE message to the server
for message-summary updates.
X ranges from 1 to 6 (for SIP-T28P).
X ranges from 1 to 3 (for SIP-T26P/T22P).
X ranges from 1 to 2 (for SIP-T20P).
Web User Interface:
Account->Advanced->Subscribe for MWI
Phone User Interface:
None
account.X.subscribe_mwi_expires
Description:
Configures MWI subscribe expiry time (in seconds) for account X.
The IP phone is able to successfully refresh the SUBSCRIBE for message-summary
events before expiration of the SUBSCRIBE dialog.
X ranges from 1 to 6 (for SIP-T28P).
X ranges from 1 to 3 (for SIP-T26P/T22P).
X ranges from 1 to 2 (for SIP-T20P).
Note: It works only if the parameter "account.X.subscribe_mwi" is set to 1 (Enabled).
Web User Interface:
Account->Advanced->MWI Subscription Period (Seconds)
Phone User Interface:
None
account.X.subscribe_mwi_to_vm
Description:
Enables or disables the IP phone to subscribe the message waiting indicator to the
voice mail number for account X.
0-Disabled
1-Enabled
X ranges from 1 to 6 (for SIP-T28P).
X ranges from 1 to 3 (for SIP-T26P/T22P).
X ranges from 1 to 2 (for SIP-T20P).
312
Parameters Permitted Values
Integer from 0 to
84600
0 or 1
Default
3600
0