Specifications

Configuring and Managing Integrated Modems
Managing Modems
DC-75
Cisco IOS Dial Technologies Configuration Guide
Configuring Cisco Integrated Modems Using Modem Attention Commands
This section provides information about using modem attention (AT) command sets to modify modem
configuration. It contains the following sections:
• Using Modem Dial Modifiers on Cisco MICA Modems (As required)
• Changing Configurations Manually in Integrated Microcom Modems (As required)
• Configuring Leased-Line Support for Analog Modems (As required)
Using Modem Dial Modifiers on Cisco MICA Modems
Dial modifiers permit multistage dialing for outbound modem calling through public and private
switched telephone networks (PSTNs).
Note For additional information about dial modifiers for the MICA modems, search Cisco.com for the
publication AT Command Set and Register Summary for MICA Six-Port Modules.
The Cisco NAS Modem Health feature is enabled by arguments to the ATD AT command. The AT prefix
informs the network access server modem that commands are being sent to it, and the D (dial string or
dial) suffix dials a telephone number, establishing a connection. With NAS Modem Health feature, you
can enter the dial modifiers listed in Table 11 after the D in your dial string: X, W, and the comma (,)
character. These modifiers had been previously accepted without error but ignored in Cisco MICA
modems on Cisco AS5300 and Cisco AS5800 universal access servers.
In the following example dial string, the portion of the string before the X is dialed for the given line
type used in your configuration. All digits after the X generate the appropriate DTMF tones.
atdT5550101x,,567
Table 11 Dial Modifiers for Cisco MICA Modems
Dial
Modifier Definition
X Switches to in-band dual tone multifrequency (DTMF) mode for any subsequent digits
remaining in the ATD string. The X dial modifier has been added to serve as a delimiter for
the host when the dial string is processed. It allows Cisco MICA portware to be used in
many environments that do not support DTMF dialing (for example, PRI).
W Waits for dial tone and then switches to in-band DTMF mode for any subsequent digits
remaining in the ATD string. The W dial modifier also acts as a delimiter between the
primary and secondary sections of the dial string, so that no additional X modifier is
needed. Once either an X or a W has been parsed in the dial string, any additional X
modifiers are ignored. Additional W modifiers cause Cisco MICA modems to wait for a
dial tone.
, Delay: Number of seconds in S8. Default is 2 seconds. The comma (,) dial modifier is
treated as a silent DTMF tone for the duration of seconds specified in S8. The comma is
acted on only after the call switching module (CSM) has made the transition to DTMF
mode, which requires that it either follow an X or a W in the dial string, or that the T1/E1
be configured for DTMF signaling.