Yealink SIP-T48G Administrator's Manual page 352

Administrator's Guide for SIP-T2_Series_T4_Series IP Phones
X ranges from 1 to 12 (for SIP-T42G).
X ranges from 1 to 6 (for SIP-T41P/T27P).
X ranges from 1 to 3 (for SIP-T23P/G).
X ranges from 1 to 2 (for SIP-T21(P) E2).
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.
X ranges from 1 to 16 (for SIP-T48G/T46G/T29G).
X ranges from 1 to 12 (for SIP-T42G).
X ranges from 1 to 6 (for SIP-T41P/T27P).
X ranges from 1 to 3 (for SIP-T23P/G).
X ranges from 1 to 2 (for SIP-T21(P) E2).
The IP phone is able to successfully refresh the SUBSCRIBE for message-summary
events before expiration of the SUBSCRIBE dialog.
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
Note: It works only if the parameters "account.X.subscribe_mwi" is set to 1 (Enabled)
and "voice_mail.number.X" is configured.
X ranges from 1 to 16 (for SIP-T48G/T46G/T29G).
X ranges from 1 to 12 (for SIP-T42G).
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Parameters Permitted Values
Integer from 0 to
84600
0 or 1
Default
3600
0