The LS LED is flashing, and I can't make a call out on a known working ISDN circuit.For the US NI-1, DMS-100, and AT&T 5ESS switch types, the LS LED flashes and will become solid when if only one SPID number is given and it is verified (correct) or after two SPID numbers are verified (correct) if two were given. If the SPID(s) are not correct or it was not possible to send the SPID information to the central office (possibly the physical layer is down), then the LS LED will continue to flash.
1) Open a HyperTerminal session if you are using a Windows-based PC or use some other terminal emulation software and communicate with the COM port of the TA.
2) Type the command AT@CONFIG.
3) Verify that the SPID numbers are correctly entered and that the switch type is also correct. Many times the ISDN service provider (telephone company) tells you the type of hardware they are using, but the hardware is run by a specific software protocol (called the switch type). Make sure you know which software protocol the ISDN service provider is using (US NI-1, US NI-2, DMS-100, or AT&T 5ESS). For US NI-2 switches, use the US NI-1 switch type in the TA.
4) Set the Terminal Endpoint Identifier to AUTO.
5) Exit and save the profile to the TA.
6) Now enter the command AT!L to verify that the SPID (Service Profile Identifier) numbers are correct. If it is still not correct, you may need to contact technical support for more instructions and this may also mean your ISDN service provider needs to be contacted to resolve the setup issues.