modem configured but not working

Thanks for the help in advance.
I have a external 3com us Robotics 56k voice faxmodem,with usb and serial
connections.
I have it using the usb connection (I don't have a serial cable to try).

suse 10 seen it ,I configure it, I have the plug on the task bar,but it does
not work.
Its like pppd is not linked to the modem or usb port.

What is my next step. Thanks

57: USB 00.0: 10200 Modem
[Created at usb.122]
UDI:
/org/freedesktop/Hal/devices/usb_device_4c1_97_00560500000000E10A0A1E180000_
if0
Unique ID: qaNA.ymCF5rsGU3F
Parent ID: k4bc.Qlf7dkuQmR7
SysFS ID: /devices/pci0000:00/0000:00:02.0/usb1/1-8/1-8:2.0
SysFS BusID: 1-8:2.0
Hardware Class: modem
Model: "U.S. Robotics (3Com) U.S.Robotics 56000 Voice USB Modem"
Hotplug: USB
Vendor: usb 0x04c1 "U.S. Robotics (3Com)"
Device: usb 0x0097 "U.S.Robotics 56000 Voice USB Modem"
Revision: "0.90"
Serial ID: "00560500000000E10A0A1E180000"
Device File: /dev/ttyACM0
Speed: 12 Mbps
Module Alias: "usb:v04C1p0097d0090dc02dsc00dp00ic*isc*ip*"
Config Status: cfg=no, avail=yes, need=no, active=unknown
Attached to: #53 (Hub)

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