In order to really test your modem you need to call more than just 1 (your ISP's) number. If you are not getting 56k connects, you should try your modem with other local/toll/toll-free numbers. This is a list of some toll-free numbers, the 3Com "Line Test" Number (a toll-call), and links to various ISP local access number listings Setting up an account with a Free ISP is another way you can test and isolate modem/ISP problems.
1-847-330-2780 - USR Linetest number - this is a toll call; if you log-in as "Line Test" with a v.34 modem, it will attempt to determine if your line will support 56k connections.
1-847-330-4569 - US Robotics' V.92 Test number - this is a toll call; the server is a 3Com Total Control HiPer ARC running V.92 server side code that supports PCM upstream.
The following numbers use toll circuits but are free to the caller (as long as you don't log in):
1-800-245-3828 - (Canadian weather BBS)
1-800-590-4857 - (IBM Global network access # x2 and V.90 3Com Server)
1-800-784-3638 - (Netcom - supports V.90)
1-888-861-8490 - (MCI/Worldcom))
1-888-245-0113 - (AOL access x2)
1-800-716-0023 - (AOL alternate access)
1-888-296-3892 - (AT&T Worldnet accessV.90,x2)
1-800-638-1483 - (GTE Net access - V.90/K56Flex Ascend Server)
1-800-572-1959 - (Compuserve V.90,x2)
1-800-350-6885 - (Earthlink - V.90,x2)
1-800-853-7921 - (Earthlink - Flex)
1-800-534-7097 - (Earthlink - Flex)
1-800-304-4226 - (Shore.net - Flex)
1-800-320-4509 - (Ascend 56KFlex test line)
1-800-779-2966 - (Used to be MCI)
1-800-846-7562 - (Gateway BBS)
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