Gizmo5 Zfone encrypted voip phone
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Zfone
From Wikipedia, the free encyclopedia
Zfone is software for secure voice communication over the Internet (VoIP), using the ZRTP protocol. It is created by Phil Zimmermann, the creator of the PGP encryption software. Zfone works on top of existing SIP- and RTP-programs, like Gizmo, but should work with any SIP- and RTP-compliant VoIP-program.
Zfone turns many existing VoIP clients into secure phones. It runs in the Internet Protocol stack on any Windows XP, Mac OS X, or Linux PC, and intercepts and filters all the VoIP packets as they go in and out of the machine, and secures the call on the fly. A variety of different software VoIP clients can be used to make a VoIP call. The Zfone software detects when the call starts, and initiates a cryptographic key agreement between the two parties, and then proceeds to encrypt and decrypt the voice packets on the fly. It has its own separate GUI, telling the user if the call is secure. Zfone acts as if it were a "bump on the wire", sitting between the VoIP client and the Internet, but implemented in software in the protocol stack.
Zfone's libZRTP SDK libraries are released under a GPL or a commercial license. Note that only the libZRTP SDK libraries are provided under the GPL. The parts of Zfone that are not part of the libZRTP SDK libraries are not licensed under the GPL or any other open source license. Although the source code of those components is published for peer review, the intellectual property status of those components remains proprietary.
[edit] Platforms and specification
- Availability - Mac OS X, Linux, and Windows as compiled programs as well as an SDK.
- Encryption standards - Based on ZRTP, which uses 128- or 256-bit AES together with a 3,000-bit key exchange system and voice based verification to prevent man in the middle attacks.
- ZRTP Protocol - Published as an IETF draft: "ZRTP: Media Path Key Agreement for Secure RTP" [1]
- VoIP Clients - Zfone has been tested with the following VoIP clients: X-Lite, Gizmo, XMeeting, Google Talk VoIP client, and SJphone.
[edit] See also
Other encrypted voice-over-IP programs:
- PGPfone
- Gizmo Project based upon Jabber
- Skype
[edit] External links
- Zfone home page
- Phil Zimmermann official website
- CNET News: E-mail security hero takes on VoIP
- 'Wired.com' article April 03 2006
http://en.wikipedia.org/wiki/Gizmo5
Gizmo5
From Wikipedia, the free encyclopedia
 |
This article needs additional citations for verification. Please help improve this article by adding reliable references. Unsourced material may be challenged and removed. (September 2008) |
| Developed by | SIPphone |
|---|---|
| Latest release | 4.0.4.385 (Windows) / ?? |
| OS | Mac OS X, Linux, Windows, Internet Tablet OS, Symbian |
| Type | Peer-to-peer internet telephony |
| License | Freeware |
| Website | Official website |
Gizmo5 (formerly known as Gizmo Project) is the name of a peer-to-peer VoIP network and of a proprietary freeware soft phone for that network.
Gizmo Project was founded by Michael Robertson.[1] Unlike its competitor network Skype, the Gizmo5 network uses open standards for call management, Session Initiation Protocol and Jabber.[2] But it uses several proprietary codecs, and like Skype, the Gizmo5 client is proprietary/closed source software. Gizmo5 is run by the company SIPphone.
Since Gizmo5 is based on SIP, it can inter-operate with other SIP-based networks directly, although some data will always be routed via central SIPphone-servers, making it less than ideal in these settings from a privacy and security perspective.[citation needed] This avoids the phone system and is thus free of charge. Gizmo also will use encryption (SRTP) for Gizmo to Gizmo calls and works well with Phil Zimmermann's new Zfone secure add on.[citation needed]
The Gizmo5 software also has additional features that are unique to itself, such as interoperability with other systems/services via the SIP standard, built-in recording, and free voicemail. Gizmo also allows paid members of LiveJournal to make 'voiceposts' if they are unable to use the voicepost telephone lines provided by the website.[3]
Gizmo supports outbound caller ID in the United States,[4] where people commonly reject incoming calls from unknown numbers.
Gizmo 4.0 Beta offers video calling. Gizmo5 offers Gizmo on a smartphone platform.
The text chat function of Gizmo5 utilizes the Jabber protocol.[citation needed] Users using Gizmo5 can be reached through the Jabber protocol at username@chat.gizmoproject.com
Contents[hide] |
[edit] Free calls to landline/mobile phones
Gizmo5 offers free calls from a computer to the landline/mobile phones of other Gizmo users, but with restrictions that aren't fully disclosed.[5] For example, presently only 11% of US phone numbers are eligible to receive a free Backdoor call from Gizmo.[6] As a result, accounts can switch between a qualified and unqualified status without notice.[citation needed]
Mobile phones with Gizmo5 mobile cannot make phone calls to normal (PSTN) phones without using up mobile phone plan minutes. When such calls are made, the Gizmo5 service calls the phone #s of both parties and connects the call.[citation needed]
[edit] See also
[edit] References
- ^ Stevenson, Ted (May 19, 2006). "Softphones Reviewed: Gizmo Project". Voip Planet. Retrieved on 2008-09-15.
- ^ Boiko-Weyrauch, Derek (January 18, 2006). "Crowning the King of Free Talk - Skype vs. Gizmo" 1. Tom's Guide. Retrieved on 2008-09-15.
- ^ Barnard, Patrick (October 17, 2006). "LiveJournal Adds Gizmo, Letting Users Make Free VoIP Calls". TMCNet. Retrieved on 2008-09-15.
- ^ "Gizmo5 Knowledgebase". Gizmo5 (September 27, 2005). Retrieved on 2008-09-15.
- ^ "Are there any restrictions on where I can call?". Gizmo5 Knowledgebase (November 14, 2007). Retrieved on 2008-09-15.
- ^ "Backdoor Dialing". Gizmo5. Retrieved on 2008-09-15.
[edit] External links
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Gadu-Gadu, ICQ, iChat and Jabber (gtalk)
Encrypted audio chat. Supports video chat, voip to telephone (like Skype).