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+Asterisk has a number of optional build dependencies. If you intend to
+use any analogue PSTN hardware such as DigiumTDM400P, you should install
+the zaptel software and drivers before compiling Asterisk. If you will
+instead use digital telephony hardware (not IP phones) such as T1/E1
+lines or a PRI, you'll need to install libpri, again before compiling
+Asterisk.