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pbx/README.adoc: Add TOC under preamble

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== PBX README
= PBX README
:toc: preamble
:toc-title:
https://internet-in-a-box.org[Internet-in-a-Box (IIAB)] can install https://asterisk.org/[Asterisk] and https://freepbx.org/[FreePBX] for Voice over IP (VoIP) calls using regular Android and iPhone softphone (SIP) apps — e.g. for low-cost and rural telephony.
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_Historical:_ Back in February 2019, IIAB had installed Asterisk 16 and FreePBX 15, e.g. for Ubuntu 18.04, Debian 9 "Stretch" and experimentally, Raspberry Pi (https://github.com/iiab/iiab/issues/1467[#1467]).
=== What Asterisk & FreePBX do
https://en.wikipedia.org/wiki/Asterisk_(PBX)[Asterisk] is a software implementation of a private branch exchange (PBX). In conjunction with suitable telephony hardware interfaces and network applications, Asterisk is used to establish and control telephone calls between telecommunication endpoints, such as customary telephone sets, destinations on the public switched telephone network (PSTN), and devices or services on Voice over Internet Protocol (VoIP) networks. Its name comes from the asterisk (*) symbol for a signal used in dual-tone multi-frequency (DTMF) dialing.