Digium, Inc.
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Chapter 3: Telephone System Configuration
Hangup on Polarity Switch - In some countries, a polarity reversal is
used to signal the disconnect (or hang up) on a phone line. If the
Hangup on Polarity Switch option is enabled, the call will be consid-
ered “hung up” on a polarity reversal.
Call Progress - On trunk interfaces it can be useful to follow the prog-
ress of a call through Ringing, Busy, and Answering. If turned on, Call
Progress attempts to determine answer, busy, and ringing on phone
lines. This feature is highly experimental and can easily detect false
answers and hang-ups. This may cause a hang up during the middle of
a call. Few zones are supported, but can be selected with the Progress
Zone option.
Progress Zone - This option defines the call progress zone for the
trunk interfaces.
Use CallerID - If this option is enabled Caller ID detection is also
enabled.
Caller ID Start - This option allows one to define the start of a caller
ID signal. Select Ring from the drop-down list to start caller ID when
a ring is received, or Polarity, to start caller ID when a polarity rever-
sal is detected.
Caller ID - This option allows the lines to report the caller ID string as
received from the telco, or as a fixed value by using the advanced
option.
Pulse Dial - If this option is enabled, pulse dialing, instead of DTMF,
will be used.
CID Signalling - This option defines the type of caller ID signalling to
use.
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bell - Bell202 as used in the United States
