Manual



 (Plain Old
Telephone Service) codecs, which have been used for years to deliver high-quality audio over standard, dial-up

Rack is used), and the call is placed directly from one NX Rack (or legacy codec) to the other.
not supported.



supported by legacy codecs are not supported by NX Rack.
NX Rack requires that outgoing 




).

To use NX Rack on 
If possible, obtain a true telephone-company-grade line. 
will damage NX Rack, the phone system, or both.

A .

When incoming or outgoing 
 and


 and 

page.