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Yes, the NEC DTU-16D-1A can be used with a standard PSTN line. You will need to program the phone system to recognize the PSTN line instead of the ISDN2 line. Here are some steps you can take:
Access the programming mode on the NEC Xen Alpha system by pressing "Speaker" and then "7" on the main phone.
Enter the system password, which should be provided in the user manual or by your system administrator.
Press "Speaker" and then "3" to enter the line programming mode.
Scroll through the line options using the arrow keys until you find the option for PSTN. Select this option.
Save your changes by pressing "Speaker" and then "Store".
Once you have completed these steps, your NEC DTU-16D-1A handsets should be able to connect to the PSTN line and function properly.
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View and Download NEC 16D and 8D quick start user manual online. Multiline Telephone. 16D and 8D telephone pdf manual download. Also for: Dth-32d, Dth-16d, ...
When your're on a call, you press Conference, get internal dial tone, dial the extension you want or 9 plus the whole outside number you want, then press Conference again to tie the calls together. Some exts only have access to one call at a time, so if you can't make 2 calls at a time, this feature won't work.
You should only have to hit Feature - Redial and then select the soft key that you wish to re-program. Typically you will then type 1 and then the extension you want to program.
feature redial dial 00-19 for the memory location than dial a 1 than dial 9 and the full phone number than press feature to save it. If you have softkeys at the top of the phone(display) hit sta or sys to see the number you stored than pickup the receiver or hit speaker to dial the number.
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