Yealink SIP-T40P User Manual page 135

To configure the shared line settings and the number of line key on phone A via web
us er interface:
1. Register the primary account 4603.
2. Click on A dv anced, and then select Shared Call Appearance from the pull-down
list of Shared Line.
3. Enter the desired number in the Number of line key field.
This field appears only if A uto Linekeys is enabled.
Advanced Phone Features
125