AT&T offers 4 different voip plans:

AT&T CallVantage® Local Plan
Unlimited Local calling and 4¢ per minute on all Long Distance calls, including calls forwarded to non-local numbers.
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AT&T CallVantage® Service Plan
Unlimited Local and Long Distance calling in the US and to Canada
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AT&T CallVantage® 2-Line Plan
Unlimited Local and Long Distance calling in the US and to Canada for the 1st line and 500 LD minutes throughout the US and to Canada on 2nd line:
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In addition to remarkable voice quality, you'll also get these features:
- Call Log
- Phone Book
- Do Not Disturb
- Conference Calling
- Call Forwarding
- Caller ID
- Safe Forward Number
- Directory Assistance
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- Voicemail
- Locate Me
- Speed Dial
- 3-Way Calling
- Call Waiting
- E-911 Service
- Fax and Modem Support
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