User guide

4.7.1 Latency....................................................................................................................................18
4.7.2 Jitter.........................................................................................................................................18
5. Hands on – Building your PBX...........................................................................................................19
5.1 What do I need?...........................................................................................................................19
5.1.1 Installation Tips........................................................................................................................19
6. Installing Asterisk...............................................................................................................................20
6.1 Compiling Asterisk.......................................................................................................................20
6.2 Fetching Asterisk Packages.........................................................................................................21
6.3 Asterisk versions and Linux distributions......................................................................................22
6.4 Basic Asterisk Commands...........................................................................................................22
6.5 Configuration Files.......................................................................................................................23
6.6 Peers, Users and Friends.............................................................................................................25
7. Scenario A - Private telephony network in a rural community............................................................25
7.1 Background..................................................................................................................................27
7.2 Configuring the VoIP clients.........................................................................................................27
7.2.1 Community Library..................................................................................................................27
7.2.2 Hospital ..................................................................................................................................28
7.2.3 Primary School .......................................................................................................................29
7.2.4 Farmers' Association...............................................................................................................30
7.3 Configuring Asterisk ....................................................................................................................31
8. Scenario B - Reaching the PSTN ......................................................................................................34
8.1 Adding support for the TDM400P card.........................................................................................34
8.1.1 Handling PSTN incoming calls................................................................................................36
8.1.2 Making the PSTN available from the dialplan..........................................................................37
8.2 Attaching an analogue phone to the PBX.....................................................................................37
8.3 Updating the Dialplan...................................................................................................................39
9. Scenario C - Interconnecting communities using VoIP .....................................................................40
9.1 Typical satellite connection issues...............................................................................................41
9.2 Interconnecting of two Asterisk servers........................................................................................41
9.2.1 Telecentre ..............................................................................................................................41
9.2.2 Training Centre........................................................................................................................43
9.2.3 The register command............................................................................................................44
10. Learning more..................................................................................................................................44
11. Conclusions.....................................................................................................................................44
12. Appendix A: Making IP Telephony knowledge accessible. .............................................................45
12.1 Introduction................................................................................................................................45
Page 2 TRICALCAR | www.wilac.net/tricalcar – Version: February 2008