Frequently Asked Questions for FreeBSD 2.X : Serial Communications : Why doesn't the @ sign for the phone number capability work?
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11.12. Why doesn't the @ sign for the phone number capability work?

The @ sign in the pn capability tells tip to look in /etc/phones for a phone number. But the @ sign is also a special character in capability files like /etc/remote. Escape it with a backslash: 

            pn=\@

Frequently Asked Questions for FreeBSD 2.X : Serial Communications : Why doesn't the @ sign for the phone number capability work?
Previous: How am I expected to enter these AT commands without resorting to some DOS-based terminal program?
Next: How can I dial a phone number on the command line?