Open source VoIP Networks

Transcription

1 Open source VoIP Networks Standard PC hardware inexpensive add-in vs. embedded designs Ing. Bruno Impens

2 Overview History Comparison PC - Embedded More on VoIP VoIP Hardware VoIP more than talk More...

3 What s needed for a pbx Interfaces: ISDN,BRI, PRI, E1, T1 ANALOG Switching Matrix Connect time slots Management Time slot attribution, accounting, configuration,... Features like IVR, Music on hold, Queues, Conference calls VoIP

4 Traditional Approach Purpose build hardware Switching backplane Dedicated plugin boards for E1, T1, BRI,... Central controller +software Tends to be expensive hardware, DSP s Limited production runs Hardware has difficulties to follow rapid protocol developments. Some vendors are already at their 3th VoIP platform Build to last and be reliable. Closed platforms, protocols,... Locked in to one vendor Options are expensive and often require dedicated hardware to run on

5 Asterisk approach Port analog pc board became available ±$1000 beginning of Computer Telephony Jim Dixon published the Zapata telephony card including schematics on the web. Mark Spencer created Linux application to use it for telephony services.

6 General Idea Central processor is fast enough to handle all signaling, decoding,... PC bus can handle all this traffic Hardware has to handle analog world Inexpensive pc s and cards Easily modifiable Core = software TDM switching Extra Functionality = application

7 Example applications Use of applications in dialplan exten=> 1234, Dial(SIP/1234,25) exten=> 1234,2,Voic 2 (u1234) exten=> 111, Background(press-a-number) exten=> 111,2,Goto(1) exten=>_x,1,saydigits(${exten})

8 More Apps Apps written in C >100 available MeetMe(conf#) : Multiparty conference Monitor : call recording in wav or gsm SetMusicOnHold : play music from MP3 or wav Voic recorded voic , sent by mail to user. AGI asterisk gateway interface similar to CGI to script the core also interfaces to ODBC,SQL,.

9 Logic behind it Cheap Hardware Server type PC port ISDN Card 795 Software / Management Open Source Base price 1695 Asterisk learning curve? Voice recordings, localization,...? Street price for a configured and installed PBX 5000 Since it is a pc you can also use well known applications -Database, web server, router, firewall,vpn,... PBX applications are endless.

10 Interface Hardware Junghanns Octo BRI PCI ISDN: Digium TE110P ISDN-30 interface: Digium TE411P Quad- Span (3.3 V) with HW EC:

11 VoIP Endpoints

12 Let s talk VoIP H.323, SIP, MGCP, Skinny, AIX, Skype, Gizmo project How to call old world VoIP Providers Gateways ENUM? DUNDI?

13 Enum Enum to match numbers with servers Fully qualified E.164 number Stripped and turned around to Translated into e164.arpa DNS request do give you a server to contact. Still not in production Alternatives for now ex: E164.lu Limitations requires athority to manage numbers You need a fully qualified number, partial matches not possible No notion of pricing, spamming, private/public number

14 DUNDi Distributed universal number discovery Trusted nodes peer with each other Number request to on of them If not known request to neighbors Answer is cached Features e164 Weight system like DNS MX weight FLAGS for Privacy, partial match, non commercial calls,.. context Acces to info depending on context ex: In company or E164 global public peering context fro E.164 numbers Peers have to agree to GPA Thrown out of trust network for abuse or misuse

15 Why all the fu$$ Low cost calling appeals to business and hone users. Tele-workers call free internally and centralized outgoing. Calls between offices over IP network VoIP pricing Belgacom Tele2 Voipgate WeePee Neighbors 18,7 7/32 2,6/18,7 2,1/16 South- Africa? 40/68 9,5/17,5 6,3/18 Australia 50 13/38 4,8/16,3 1,7/17,2 USA 18,7 7/32 4,8/4,8 1,3/1,3

16 Mini Demo Xten softclient SIP call to asterisk on same Powerbook Asterisk Translates to IAX2 Dial 500 to reach digium support USA Dial to weepee.be Out to telephone network One IP port used, no firewall configuration Same portable runs sofclient, pbx and presentation.

17 More info Asteriskathome.sourceforge.net

18 Thanks for the attention