Yealink SIP-T2 SERIES Administrator's Manual page 594

Administrator's Guide for SIP-T2 Series/T19(P) E2/T4 Series/CP860 IP Phones
Parameters
X ranges from 1 to 15 (for SIP-T42G/T41P)
X ranges from 1 to 21 (for SIP-T27P)
X ranges from 1 to 3 (for SIP-T40P/T23P/T23G)
X ranges from 1 to 2 (for SIP-T21(P) E2)
For ext keys:
X ranges from 1 to 6, Y ranges from 1 to 20, 22 to 40 (Ext key 21 cannot be
configured).
Note: It is not applicable to SIP-T19(P) E2, CP860 IP phones.
Web User Interface:
DSSKey->Line Key->Label
Phone User Interface:
Menu->Features->DSS Keys->Line Key X->Label
To configure auto linekeys feature via web user interface:
1. Click on Features->General Information.
2. Select Enabled from the pull-down list of Auto Linekeys.
If Auto LineKeys is enabled, you can automatically assign multiple DSS keys with
Line type for a registered shared line on the phone.
3. Click Confirm to accept the change.
572
Permitted
Values
Default