Samsung IPX-S300B System Description page 58

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When the status is Idle, the call is made to the person by pressing the button.
When the other party's call is ringing, Direct Pick can be performed by pressing the
button.
When the other party is on the phone, can Barge In by pressing the button.
(when having the Barge In authority)

Speed Dial
When pressing the button, a call is made to the registered dial number.

Line
Same to the right line button of a phone. When the button is pressed, the line that is
pre-assigned is seized then waits for the user's dial input.
DTMF Detection Services
During a call between SIP phones on an IP PBX, all data except SIP signaling for call
connection is exchanged by the phones. Therefore, the numbers dialed for services-except
the phone number included in the INVITE message for call connection-cannot be sent to
the system using the standard protocol.
In order to receive the numbers dialed on the phone-except the INVITE message-IPX-
S300B connects the call to its built-in voice announcement system and collects the
numbers dialed on the phone according to the voice announcement.
User interaction services provided in this way include account code, call authentication
code, and DISA user authentication.

Account Code
This feature allows the user to enter his/her account code in the account information
when making an external call through the trunk. Account codes can be entered in the
following two ways.

Forced Account Code
When a trunk call is made from a phone set with forced account code input, a
registered account code must be entered. The account code entered will be saved in the
charging data record (CDR), which can be used for calculating call charges for the user.

Voluntary Account Code
When a trunk call is made from a phone set with voluntary account code input, you
can press the account code button and enter an account code in advance before making
the call, or you can put your current call on hold, press the account code button, enter
an account code, and then reconnect the call on hold. The account code entered will be
saved in the charging data record (CDR), which can be used for calculating call
charges for the user.
When a trunk call is made on a phone set with forced account code input, actions are
performed in the following order:
The user dials an access code and an external number.
If the user's phone is set with forced account code input, SCM connected the call to its
built-in voice announcement system.
The voice announcement system plays an announcement for the user to enter a
registered account code.
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page 58 of 162