Sony DT310 User Manual

The doorphone is used to monitor the admission to your
company, i.e you can open the doorlock from your phone.

Press
You will be in speech connection with the calling party.

After you have answered the doorphone, you can open the
door making an inquiry to the door-opener’s directory number

Dial the door-opener´s directory number 
Please ask your system administrator for the number.

The tandem configuration is a unit, consisting of two telephones
using the same directory number. One of the telephones is 
defined as the ”Primary” and the other one as the ”Secondary”.
This function enhances the communication for users that, for
example, have a wired phone on their desk (the ”primary
telephone”) and need to be mobile within their company’s
building with their own portable (the ”secondary telephone”).
Basically the tandem configuration works as follows:

Dial to log on the secondary telephone
The DT368 display indicates that a second user is logged on.

For incoming calls:
• Both telephones are treated as 1 single extension.

For outgoing calls:
• Both telephones are treated as 2 separate extensions.