Google battles MicroSkype with 'open' VoIP protocol

Google has moved its Google Talk VoIP infrastructure to Jingle, the voice and media signaling protocol that seeks to provide an open-standard alternative to the proprietary protocols used by the Microsoft-owned Skype and other VoIP technologies.

With an email on the XMPP Standards Foundation mailing list, Google's Peter Thatcher announced that the company is now supporting the Jingle XEP-166 and XEP-167 protocols for Google Talk calls to and from Gmail, iGoogle, and Orkut, the company's Brazil-friendly social network.

Google has also added the same support to libjingle , the Voice and P2P Interoperability Library used by many Google Talk native clients. The company intends to update the Google Talk Android client to Jingle, but it will not move the Windows client. Apparently, on Windows, Google will challenge MicroSkype solely through the browser.

The idea is to allow for calls between competing services. "I hope that this will be a support to the Jingle community and further our efforts to have open standards for voice and video communication," Thatcher's email reads.

Thatcher did not immediately respond to a request for comment. But his email goes on to say that Google will eventually retire its old protocol, which served as a basis for Jingle.

Google was among those who originally developed Jingle, but some had criticized the company for not moving its own infrastructure to the new protocol. Senko Rašić – a developer at Collabora, one of the other VoIP companies behind the standard – was among Google's critics , but he met Thatcher's announcement with nothing but praise.

"This is great news. Google has been one of the driving forces behind Jingle, but as they were implementing it far in advance of being standardised, the drafts/standards have since changed," he said with a comment on Hacker News . "Other implementations have to maintain support for several close but not quite the same dialects. Google updating their software will make interop much easier."

Jingle was developed by Google, Collabora, Yate, and two VoIP outfits that are now part of Cisco: Tandberg and Jabber. At the XMPP Standards Foundation, Jingle is now a "draft" standard, having moved from "experimental" status two years ago. In a canned statement, XMPP Council Chair Kevin Smith echoed Rašić. "Google’s updates to use the standardised Jingle protocols will mean an increased chance of interoperability for streaming audio between XMPP users and will hopefully entice more developers into producing implementations and contributing to the standards process,” he said.

NTP Time Server Frequently Asked Questions | SBJX

: Yunaiteddotekunorojizu – based on the Coordinated Universal Time to tell time, atomic clock based on a global scale. These clock years in approximately the order is accurate, 'leap seconds ' UTC is more than you need to be added to the Earth 'and the rotation is slowing, Mon thanks' is accurate gravity.

Q: What is network time?

: NTP time server, network device, the received signal to other devices on the network, UTC has been assigned to a period of time, network time well known. The NTP protocol is the amount of time, every machine, please make sure that time is synchronized.

Q: Where Network Time, UTC time do you receive from?

: UTC time reference, where you can take a few sources. The Internet, UTC is the communication signals at different times in their hundreds of servers is the most obvious time. But these are dependent on many variables, not the Internet that do not have a secure source is known to be accurate, and appropriate security concerns for any computer. It is UTC time is a reliable source, accurate and safer, or other methods GPS (Global Positioning System) is offered is to use the transmission frequency of the radio transmission wave Ito Takeshi time and national networks .

Q: Do I can receive from any local radio time signal?

: Unfortunately not. National Physical Laboratory time only a few countries, limited broadcast signals, these signals are more susceptible to interference. From Colorado, the United States in the MSF broadcast signal known as the Cambrian British Broadcasting Corporation's WWVB, also known as. A similar system in Germany, Japan, France and Switzerland to exist.

Q: How GPS signal?

: Satellite navigation system, atomic clock time signals from GPS relies on satellites. The GPS Network Time Server is a triangle that is used to signal this time can be installed via the receiver antenna. Global positioning system, the antenna is required to have a clear view of the sky offers a ubiquitous world.

Q: If I have a large network, I would need to do more than one network time?

: The Not necessarily. NTP is has a hierarchical structure is divided into 'class ' s, the server from a Layer 2 devices, atomic receiving a clock signal of a time server and network equipment devices of Class 1 receives a time signal The clock, stratum 0 device it. NTP support of 12 layers (in fact, more is possible), each class can be used as a device to be used simultaneously. This double-layer device can be synchronized to another machine with very low off the ground. This is no matter how many networks, network time means only that you need.

Communication Protocol Engineering

The ARRL handbook for radio communications

McGraw-Hill encyclopedia of science & technology, MET-NIC.

Wireless sensor networks, signal processing and communications perspectives

Military communications, from ancient times to the 21st century