要建立與內置或集成modem的（在路由器中）的直接連接對話，如CiscoAS5200中Microcom modem所要求的，首先用modem at-mode命令打開直接連接對話，然后向指定modem發送一個AT命令。例如，下例向modem 1/1發AT命令at/s：
    AS5200# modem at-mode 1/1
You are now entering AT command mode on modem (slot 1 / port 1).
Please type CTRL-C to exit AT command mode.
at%v
MNP Class 10 V.34/V.FC Modem Rev 1.0/85
OK
at/s
IDLE 000:00:00
LAST DIALNET ADDR: FFFFFFFFFFFF
MODEM HW: SA 2W United States
4 RTS 5 CTS 6 DSR - CD 20 DTR - RI
MODULATION IDLE
MODEM BPS 28800 AT%G0
MODEM FLOW OFF AT/G0
MODEM MODE AUT AT/N3
V.23 OPR. OFF AT%F0
AUTO ANS. ON ATS0=1
SERIAL BPS 115200 AT%U0
BPS ADJUST OFF AT/J0
SPT BPS ADJ. 0 AT/W0
ANSWER MESSGS ON ATQ0
SERIAL FLOW BHW AT/Q3
PASS XON/XOFF OFF AT/X0
PAR99vY 8N AT