143 lines
5.4 KiB
HTML
143 lines
5.4 KiB
HTML
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<TITLE>VoIP Howto: Requirement</TITLE>
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<LINK HREF="VoIP-HOWTO-6.html" REL=next>
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<LINK HREF="VoIP-HOWTO.html#toc5" REL=contents>
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<A HREF="VoIP-HOWTO-6.html">Next</A>
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<A HREF="VoIP-HOWTO.html#toc5">Contents</A>
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<HR>
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<H2><A NAME="s5">5. Requirement</A></H2>
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<H2><A NAME="ss5.1">5.1 Hardware requirement</A>
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</H2>
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<P>To create a little VoIP system you need the following hardware:
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<P>
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<OL>
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<LI>PC 386 or more</LI>
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<LI>Sound card, full duplex capable</LI>
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<LI>a network card or connection to internet or other kind of interface
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to allow communication between 2 PCs</LI>
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</OL>
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<P>All that has to be present twice to simulate a standard communication.
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<P>The tool above are the minimal requirement for a VoIP connection:
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next we'll see that we should (and in Internet we must) use more
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hardware to do the same in a real situation.
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<P>Sound card has be full duplex unless we couldn't hear anything
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while speaking!
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<P>As additional you can use hardware cards (see next) able to manage
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data stream in a compressed format (see Par 4.3).
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<H2><A NAME="ss5.2">5.2 Hardware accelerating cards </A>
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</H2>
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<P>We can use special cards with hardware accelerating capability.
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Two of them (and also the only ones directly managed by the Linux
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kernel at this moment) are the
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<P>
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<OL>
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<LI>Quicknet PhoneJack</LI>
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<LI>Quicknet LineJack</LI>
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<LI>VoiceTronix V4PCI</LI>
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<LI>VoiceTronix VPB4</LI>
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<LI>VoiceTronix VPB8L</LI>
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</OL>
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<P>Quicknet PhoneJack is a sound card that can use standard algorithms
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to compress audio stream like G723.1 (section 4.3) down to 4.1 Kbps
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rate.
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<P>It can be connected directly to a phone (POTS port) or a couple
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mic-speaker.
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<P>It has a ISA or PCI connector bus.
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<P>Quicknet LineJack works like PhoneJack with some addition features
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(see next).
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<P>VoiceTronix V4PCI is a PCI card pretty like Quicknet LineJack
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but with 4 phone ports
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<P>VoiceTronix VPB4 is a ISA card equivalent to V4PCI.
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<P>VoiceTronix VPB8L is a logging card with 8 ports.
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<P>For more info see
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<A HREF="http://www.quicknet.net">Quicknet web site</A> and
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<A HREF="http://www.voicetronix.com.au">VoiceTronix web site</A><H2><A NAME="ss5.3">5.3 Hardware gateway cards</A>
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</H2>
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<P>Quicknet LineJack and VoiceTronix cards can be connected to a
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PSTN line allowing VoIP gateway feature.
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<P>Then you'll need a software to manage it (see after).
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<H2><A NAME="ss5.4">5.4 Software requirement</A>
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</H2>
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<P>We can choose what O.S. to use:
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<P>
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<OL>
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<LI>Win9x</LI>
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<LI>Linux</LI>
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</OL>
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<P>Under Win9x we have Microsoft Netmeeting, Internet Phone, DialPad
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or others or Internet Switchboard (from
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<A HREF="http://www.quicknet.net">Quicknet web site</A>) for Quicknet cards.
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<P>Warning!!: Latest Quicknet cards using Swithboard (older version
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too) NEED to be connected to Internet to get working for managing
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Microtelco account (not free of charge), so if you plan to remain
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isolated from Internet you need to install
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<A HREF="http://www.openh323.org">OpenH323 software</A>.
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<P>For VoiceTronix cards you can find software at
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<A HREF="http://www.voicetronix.com.au">VoiceTronix web site</A><P>Under Linux we have free software
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<A HREF="http://www.gnomemeeting.org">GnomeMeeting</A>, a clone of Microsoft Netmeeting,
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while in console mode we use (also free software) applications from
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<A HREF="http://www.openh323.org">OpenH323</A> web site: simph323 or ohphone that can also work with Quicknet accelerating
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hardware.
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<P>Attention: all Openh323 source code has to be compiled in a user
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directory (if not it is necessary to change some environment variable).
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You are warned that compiling time could be very high and you could
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need a lot of RAM to make it in a decent time.
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<H2><A NAME="ss5.5">5.5 Gateway software</A>
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</H2>
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<P>To manage gateway feature (join TCP/IP VoIP to PSTN lines) you
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need some kind of software like this:
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<P>
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<UL>
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<LI>
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<A HREF="http://www.quicknet.net">Internet SwitchBoard</A> (only when connected to Internet) for Windows systems also acting
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as a h323 terminal;</LI>
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<LI>PSTNGw for Linux and Windows systems you download from
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<A HREF="http://www.openh323.org/code.html">OpenH323</A>.</LI>
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</UL>
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<H2><A NAME="ss5.6">5.6 Gatekeeper software</A>
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</H2>
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<P>You can choose as gatekeeper:
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<P>
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<OL>
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<LI>Opengatekeeper, you can download from
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<A HREF="http://www.opengatekeeper.org">opengatekeeper web site</A> for Linux and Win9x.</LI>
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<LI>Openh323 Gatekeeper (GK) from
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<A HREF="http://www.willamowius.de/openh323gk.html">here</A>.</LI>
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</OL>
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<H2><A NAME="ss5.7">5.7 Other software</A>
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</H2>
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<P>
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<A NAME="Phonepatch"></A> In addition I report some useful software h323 compliant:
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<P>
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<UL>
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<LI>Phonepatch, able to solve problems behind a NAT firewall. It
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simply allows users (external or internal) calling from a web page
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(which is reachable from even external and internal users): when
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web application understands the remote host is ready, it calls (h323)
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the source telling it all is ok and communication can be established.
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Phonepatch is a proprietary software (with also a demo version for
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no more than 3 minutes long conversations) you download from
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<A HREF="http://www.equival.com/phonepatch">here</A>.</LI>
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</UL>
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<HR>
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<A HREF="VoIP-HOWTO-6.html">Next</A>
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<A HREF="VoIP-HOWTO-4.html">Previous</A>
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<A HREF="VoIP-HOWTO.html#toc5">Contents</A>
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