Information Technology Reference
In-Depth Information
Finally, you can use the syntax shown in Example 6-4 to configure caller ID information
for the device attached to the FXS port.
Example 6-4
Configuring FXS Port Caller ID Information
CME_Voice(config)#
voice-port 0/0/0
CME_Voice(config-voiceport)#
station-id name 3rd Floor Fax
CME_Voice(config-voiceport)#
station-id number 5551000
This configuration allows other devices in your system to receive caller ID name and num-
ber information any time the device attached to the FXS port places a call to them.
Foreign Exchange Office Ports
FXO ports act as a trunk to the public switched telephone network (PSTN) central office
(CO) or private branch exchange (PBX) systems, as shown in Figure 6-2.
Key
To p i c
PBX System
FXO 2/0/0
FXO 2/0/1
PSTN
Figure 6-2
FXO Port Connections
FXO ports use many of the same commands as FXS ports, such as
signal
to set loop start
or ground start signaling and
station-id
to set caller ID information. Two additional com-
mands are of note:
dial-type
■
ring number
■
The
dial-type <dtmf/pulse>
command allows you to choose to use dual-tone multifre-
quency (DTMF) or pulse dialing. Yes, some areas of the world still require the use of pulse
dialing (and rotary phones). If you are installing a voice network into one of these areas,
this command is for you.
The
ring number <number>
command allows you to specify the number of rings that
should pass before the router answers an incoming call to the FXO port. By default, this is
set to one ring, which causes the router to answer an incoming call immediately. There
