Voice over Internet Protocol (VoIP) using Asterisk

Transcription

1 Voice over Internet Protocol (VoIP) using Asterisk Associate Professor Information Systems San Francisco State University San Francisco, CA USA Presentation and Demo at Peninsula Linux Users Group, June 28, 2007

2 about myself 2

3 about myself teach: those of us who can't do... research: diffusion and adoption (open source, mobility) fun: ubuntu, maemo/nokia770, olpc/sugar, mythtv, nocat... 3

4 agenda introduction asterisk demo astlinux trixbox 4

5 family tree telephony free and open source asterisk astlinux proprietary openpbx trixbox xorcom rapid yate elastix gnu bayonne VoIPonCD... 5

6 VoIP more about networking......less about telephony 6

7 acronyms VoIP Voice over Internet Protocol POTS Plain Old Telephone Service ATA Analog Telephone Adapter DTMF Dual Tone Multi Frequency SIP Session Initiation Protocol IAX Inter Asterisk exchange PBX Private Branch exchange SBC Single Board Computer 7

8 advantages Network based digital by design IP based economies of scale and scope Crossover to e mail, IM, etc. CRM integration e.g. SugarCRM No toll boundaries IP goes everywhere One infrastructure to worry about 8

9 disadvantages New adoption issues Migration from legacy systems will cost $$$ Innovative requires a big change How will telcos overbill???? 9

10 design as a network application If you assess your requirements from a network perspective, the design is more intuitive Think of VoIP as an application along the lines of e mail Accounts follow a <name>@<registrar> syntax Account may map to a 7 or 10 digit phone number if system relays to POTS lines 10

11 asterisk the project Asterisk was originally written by Mark Spencer of Digium, Inc. Released under GPL. Project began in 1999 or so. Core PBX + support services such as voic , call forwarding, conference calling, etc. 11

12 three scenarios Home use Small business use Small to Medium Enterprise (SME) use 12

13 scenario 1 Home use No POTS lines involved. Extensions for family and friends. All calls happen on PCs or ATAs. 13

14 scenario 2 Small business One or two POTS lines for incoming/outgoing calls. Extensions for Tech Support, Sales, Customer Service. Generic operator extension. Numeric extensions and voice mail for employees. 14

15 scenario 3 Small to mid size business Multiple POTS and VoIP lines for incoming/outgoing calls. Aggregation of lines for multiple calls (rollover dialing). Specific lines and providers for long distance and international calling. 15

16 dial plan scenario dial plan 16

17 sample dial plan Extension 101 Extension 201 Me Wife 101 Ekiga SoftPhone on Ubuntu 201 X Lite on Windows XP SIP SIP Asterisk Extension 301 Daughter 301 Telephone + ATA IAX 17

18 presence based dial plan Extension 101 Extension 102 me Laptop (mobile) myself Desktop (office) IAX SIP Asterisk Extension 103 I Desktop (Home) SIP 18

19 sample family dial plan Extension Member Myself Wife Kid Mom Dad Brother Sister Cousin Aunt Protocol SIP SIP IAX SIP IAX IAX IAX SIP SIP Location San Francisco San Francisco San Francisco Chattanooga Chattanooga New Delhi Hyderabad Aberdeen Singapore 19

20 sample business dial plan Extension Member Sales Customer Service Technical Support VP Biz Dev VP Ops Dev Team Lead QA Team CRM team Asia Rep Protocol SIP SIP SIP SIP SIP IAX IAX IAX IAX Location San Francisco, CA San Francisco, CA Hyderabad, India San Jose, CA Columbus,OH Bangalore, India Dhaka, Bangladesh London, UK Singapore Use IAX for end points with lesser known variables such as NAT. 20

21 astlinux Linux 2.6 Soekris and WRAP Asterisk 1.2 mini_httpd + PHP in CGI mode OpenSSH OpenSSL "keydisk" support "PBX Only Mode" Asterisk only ftp server (vsftpd) Sangoma A101/102/104/S518 support SNMPD for lm_sensors rp pppoe traffic shaper (iptables+tc) tftp server 21

22 astlinux Embedded Linux for Asterisk Live CD ISO is about 70 MB CF card fits under 64 MB Targeted for Soekris or WRAP SBCs Needs Pentium class 266 MHz or better GUI via web browser All scripts are editable via textarea boxes on web pages. Additional stats, PHP, httpd, available via browser 22

23 embedded boards soekris 23

24 embedded boards WRAP Note: AMD has discontinued the SC1100 CPU 24

25 open source maturity model OSMM is a trademark of Navica. A chart like this will make you a hero at work. PHB image used without permission 25

26 OS Image astlinux config CD iso VMWare image Compact Flash config+log+voic USB Keydisk Hard Drive 26

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30 edit config astlinux requires hand editing config files extensions.conf sip.conf iax.conf 30

31 astlinux config sip.conf extensions.conf iax.conf 31

32 ekiga softphone (SIP and H323) 32

33 openwengo (SIP) Image used from 33

34 linphone (SIP) Image used from VoIP.html 34

35 x lite for MS Windows (SIP) Image from sb.de/voip/fopra/node83.html 35

36 iaxcomm (IAX) 36

37 kiax (IAX) 37

38 astlinux demo 38

39 more complex solutions Trixbox Used to be Home Combines several open source projects into one distro. CentOS based Caution: Wipes out the entire hard drive!!! If you simply want to play with VoIP, use AstLinux live CD. 39

40 trixbox dial plan Extension Phone Protocol Location Ekiga on Laptop Gizmo on Nokia Ekiga at Home SIP SIP SIP IAX SIP SIP Mobile Mobile San Francisco PenLUG Mobile SF State IAXy X Lite on Laptop Desk Phone 40

41 trixbox 101 Ekiga on Ubuntu (Laptop) 102 Gizmo on Nokia 770 Trixbox at SF State 105 X Lite on Windows (Laptop) 111 POTS Phone at SF State via Zaptel 103 Ekiga on Ubuntu (Home) 104 POTS Phone via IAXy (PenLUG) 41

42 dev kit used in demo TDM400P from Digium IAXy S101 from Digium Photo from fxo small.jpg Photo from info.org/users/385/25385/images/618/iaxy.jpg 42

43 trixbox demo 43

44 resources

45 resources info.org/wiki/ info.org/wiki/view/astlinux

46 contact 46