Switching to VoIP

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Asterisk Channels

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WaitMusicOnHold

WaitMusicOnHold(seconds)

Identical to Wait( ), but plays the music-on-hold class associated with this call or

context while the caller is waiting.

Zapateller

Zapateller( )

Sends the do-not-call signal to incoming callers.

ZapBarge

ZapBarge(channel)

Allows caller to clandestinely listen in on another channel’s call in progress, as long

as it’s a Zaptel channel. Neither party in the conversation will know that the call is

being monitored by the “barging” caller. If you don’t provide a channel name, the

caller will be prompted for one. Entering 1# would listen in on Zap/1, while enter-

ing 3# would listen in on Zap/3.

ZapScan

ZapScan( )

Scans Zaptel channels to monitor calls. Pressing # moves to the next channel. Press-

ing the star key (

*) exits to the next priority.

Asterisk Channels

While extensions.conf is the main place Asterisk’s dial-plan is configured, other files

are needed to set up the VoIP and TDM interfacing necessary to allow the Asterisk

server to communicate with the outside world. These files include zapata.conf,

zaptel.conf, and sip.conf.

Zaptel Channels

Digium’s Wildcard interface cards enable legacy channels so Asterisk can communi-

cate using T1s and analog phones or POTS lines. Chapter 3 describe how to obtain

and install Asterisk with