VOIP

[a href] http://www.codeguru.com/forum/showthread.php?t=482681 [/a href]

Tradisional Telephony Problem Compare to VOIP
1. Eavesdropping
2. Difficult in Maintenance
3. Costly
4. require point to point connection
5. Consume high bandwidth requirement
6. interfere with audio streams
7. DDOS
8. Spit = Spam Over VOIP
9. Phishing, snooping and spoofing.
10. Latency (delay)
11. Affect current network architecture
12. Under going rapid development not stable
13.





Solution :
1. VOIP with zrtp and codec compression

Function :
1. Encryption
2. Compression
3. Hide caller
4. Call History
5. Call Graph
6. Session border controller to protect private VOIP network
7. Voice VPN
8. Streaming Audio Recorder (Oreka)

VOIP Protocol
1. H.323
2. SIP
3. RTP
3. Secure RTP
4. ZRTP




http://www.testyourvoip.com/
http://voip.about.com/od/voipfeatures/a/featuresvoip.htm

Echo
= Sound reflection
Causes of echo
1. Noise level
2. Latency
http://www.solicall.com/

http://en.wikipedia.org/wiki/IP_PBX
http://www.linuxjournal.com/article/8424

VOIP network
Session Border Controller



* Google Search engine sip:18004664411@tf.voipmich.com +18004664411 Google 1-800-GOOG-411 Free 411 service - Speech recognition to search and connect business

* Intertex autoattendant sip:info@intertex.se

* Mouselike.org (UK) Echo and audio quality tests sip:904@mouselike.org or PSTN:+441483604781 - Allows test / connection from anywhere.

* Party Line sip:17475552663@proxy01.sipphone.com ( all-VoIP conference call every Saturday at 20:00 GMT )

* TELLME sip:18005558355@proxy01.sipphone.com (news, sports, weather)

* UCLA sip:13108254321@ucla.edu (no G.729)
* Xmission sip:xmission@pbx.xmission.com (no G.729)
* Prato City Hall, Italy - Echo test sip:05741837999@voip.comune.prato.it or iax:guest@voip.comune.prato.it/05741837999
* John Todd's screaming monkeys sip:1234@loligo.com
* http://www.telephreak.org sip:telephreak@voip.telephreak.org - The Telephreak's Free Voicemail/Conference system
* Echo test from Voxalot (USA) sip:*010600@ekiga.net Echo test from Voxalot (USA)
* Echo test from Voxalot (Europe) sip:*031600@ekiga.net
* Echo test from Voxalot (Australia) sip:*061600@ekiga.net
* Kansas State University Test Phone Number sip:*01317853950049@ekiga.net
* VoIP.Brujula.net's conference room (51112 creates a new room #12) sip:*201511@ekiga.net
* Wengo's echo test (France) sip:*248333@ekiga.net
* Blueface Monkey sounds (Ireland) sip:*266300@ekiga.net
* Blueface echo test (Ireland) sip:*266301@ekiga.net
* Blueface speaking clock (Ireland) sip:*266303@ekiga.net
* Blueface Music (Ireland) sip:*266305@ekiga.net
* Ixcall echo testsip: *318613@ekiga.net

http://www.iptel.org/sip/intro/purpose
http://www.sipdev.org/wiki/index.php/A_newcomer%27s_guide_to_SIP
http://www.ietf.org/rfc/rfc3261.txt


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