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Cisco IOS Voice, Video, and Fax Commands: R Through Sh
ring frequency
VR-580
Cisco IOS Voice, Video, Fax Command Reference
ring frequency
To specify the ring frequency for a specified Foreign Exchange Station (FXS) voice port, use the ring
frequency command in voice-port configuration mode. To restore the default value, use the no form of
this command.
ring frequency number
no ring frequency number
Syntax Description
Defaults 25 Hz on the Cisco 3600 series routers and 20 Hz on the Cisco MC3810 multiservice concentrators.
Command Modes Voice-port configuration
Command History
Usage Guidelines Use the ring frequency command to select a specific ring frequency for an FXS voice port. Use the no
form of this command to reset the default value. The ring frequency you select must match the connected
equipment. If set incorrectly, the attached phone might not ring or might buzz. In addition, the ring
frequency is usually country-dependent. You should take into account the appropriate ring frequency for
your area before configuring this command.
This command does not affect ringback, which is the ringing a user hears when placing a remote call.
Examples The following example configures the ring frequency on the Cisco 3600 series for 25 Hz:
voice-port 1/0/0
ring frequency 25
The following example configures the ring frequency on the Cisco MC3810 multiservice concentrator
for 20 Hz:
voice-port 1/1
ring frequency 20
number Ring frequency (hertz) used in the FXS interface. Valid entries on the
Cisco 3600 series are 25 and 50. Valid entries on the Cisco MC3810
multiservice concentrator are 20 and 30.
Release Modification
11.3(1)T This command was introduced on the Cisco MC3810 multiservice
concentrator.