3Com 56k User's Manual And Reference page 30

Troubleshooting
POSSIBLE SOLUTION
If you have voice mail, your dial tone may be altered because messages are waiting. Retrieve your voice mail
messages to restore your normal dial tone.
POSSIBLE SOLUTION
Your software may not have auto answer enabled. Enable the auto answer feature. In your communication
software's terminal mode, type ATS0=1 and press ENTER. You need to enable auto answer before every
session unless you alter your software's initialisation string to permanently enable auto answer.
POSSIBLE SOLUTION
You may be using the wrong power adaptor for your modem. Use only the power adaptor that came with your
modem.
PROBLEM
Both modems sound like they are exchanging carrier signals, but fail to establish a connection.
POSSIBLE SOLUTION
You may have a poor line connection. Place the call again. Calls are routed differently each time.
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