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The Computer You Are Dialing is Not Answering.  Try Again Later.

1.  Make certain that you are dialing the correct ISDN number and that it does not contain illegal characters. Is it a local call? If not, verify that the user is certain that they have clear channel Long Distance service.

2.  Verify username/password.

3.  Verify that the user's account is setup for ISDN. (ISP/auth end)

4.  Verify the POP isn't down and that it is accepting ISDN connections

5.  Verify the ISDN Router / T/A's settings (SPIDs, etc)

6.  This could be a line issue. Have the telco perform a loopback test