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There are still some features not enabled by default, but this is a
solid foundation upon which to build - a fully-functional PBX can be
built, including PSTN gatewaying using the comms/zaptel-netbsd package.
From the DESCR:
Asterisk is a complete PBX in software. It provides
all of the features you would expect from a PBX and more. Asterisk
does voice over IP in three protocols, and can interoperate with
almost all standards-based telephony equipment using relatively
inexpensive hardware.
Asterisk provides Voicemail services with Directory, Call Conferencing,
Interactive Voice Response, Call Queuing. It has support for
three-way calling, caller ID services, ADSI, SIP and H.323 (as both
client and gateway).
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