Application Level Gateway (ALG):
Application Level Gateways (ALGs) are application specific translation agents that allow an application (like VOIP) on a host in one address realm to connect to its counterpart running on a host in different realm transparently. An ALG may interact with NAT to set up state, use NAT state information, modify application specific payload and perform whatever else is necessary to get the application running across disparate address realms.

Call Processor:
component that sets up and monitors the state of calls, and provides phone number translation, user authorization, and coordination with media gateways.

Codec:
coder/decoder, which converts analog voice into digital data and back again, and may also compress and decompress the data for more efficient transmission.

Firewall Control Proxy:
component that controls a firewall’s handling of a call. The firewall control proxy can instruct the firewall to open specific ports that are needed by a call, and direct the firewall to close these ports at call termination.

H.323:
The International Telecommunications Union (ITU) standard for packet-switched network voice and video calling and signaling.

Jitter:
non-uniform delays that can cause packets to arrive and be processed out of sequence

Latency:
time delay in processing voice packets.

Media Gateway:
the interface between circuit switched networks and IP network. Media gateways handle analog/digital conversion, call origination and reception, and quality improvement functions such as compression or echo cancellation.

Media Gateway Control Protocol
common protocol used with media gateways to provide network management and control functions.

PSTN
the public switched telephone network.

QoS – Quality of Service
A network property that specifies a guaranteed throughput level.

Session Initiation Protocol (SIP)
A standard for voice and video over a packet switched network developed by IETF.

Sniffer
A network monitoring tool, usually a software tool running on a PC.

How It Works

To take advantage of MediaRing Talk’s free and discount VoIP calling services, go to MediaRingTalk.com and simply download the software to your PC. Calls can be made from your telephone linked to the Internet, a USB phone, or with a headset attached to your computer. If your computer has a built-in microphone and speakers, you can use that too.

To make a call, simply start the program and enter the phone number. Your call will be immediately connected. It’s that simple. MediaRing talk delivers crystal clear connections, and you’ll be able to talk without having to worry about racking up expensive long distance charges.

Why It’s Free

Unlike many of its competitors that generate income primarily through paid subscriptions, MediaRing Talk uses an entirely different business model that derives income through advertising. This enables the company to offer free calls to many countries and discounted rates to other destinations that are considerably lower than those offered by other industry leaders such as Skype and Vonage. MediaRing Talk currently provides computer and mobile VoIP services to millions of users and is signing up thousands more each day.

This New Year’s Day, don’t forget to call those you care about, and then stay better connected in 2010 with MediaRing Talk.

To read the rest of the news http://www.auto-mobi.info/index.php?option=com_content&task=view&id=13712&Itemid=50

With unemployment now exceeding 10 percent in many states, the thought of working abroad is appealing to a greater number of jobseekers. Expanding a job search beyond the United States is certainly not for everyone. However, for those who love learning about other cultures, can communicate in multiple languages, or have specific in-demand skills, working in a foreign country can be a tremendous career opportunity.

Excluding military personnel, there are nearly 7 million Americans currently living in over 160 countries – many of whom relocated because of career opportunities. While lots of overseas employment assignments are government positions, there are also a growing number of jobs within companies that require a global workforce.

Of course, landing that perfect overseas job does entail somewhat more effort than simply dropping into a local employer and filling out an application. Instead, a multi-pronged strategy is needed to ready yourself for the global job market, seek out employers, and prepare for the transition to another country. While there are certainly more hurdles to overcome when deciding to work overseas, the rewards can be significant. If you’re ready to start an international job search, here are five strategies that will help you on your journey to success.

Create a Plan of Action

Start by creating a plan that highlights the industries or types of businesses that match your skill set and the methods you’ll utilize to find jobs. Consider whether you want to exclusively look for positions within the government, public companies, or private firms. You will also want to determine what corporate culture you are looking for and what geographic regions that you will focus on.

Overseas job hunting does require more effort and research. Take the time to investigate citizenship and work eligibility requirements and to assess your own cultural adaptability, foreign language skills, work experience and education. Don’t hesitate to fine tune skills or obtain additional education or training if necessary. For those who are still in school, investigate distance education, foreign exchange programs, as well as internship abroad opportunities.

Prepare for the Global Job Market

Regardless if you’re job search is domestic or international, you will need clear, concise job-search correspondence that markets your skills and background effectively. Most employers outside of the United States will require a curriculum vitas (CV), as opposed to a resume. In general, a CV is a longer, more detailed, chronological overview of your entire academic and professional history; usually longer than two pages.

A well-written cover letter is another must for any jobseeker. Take the time to write an attention-getting introductory paragraph explaining why you’re interested in the position. Make sure to weave into your text your most relevant skills and accomplishments. Don’t forget to close the letter with a request for an interview and always address the letter to a real person (hiring manager, human resources director, or other decision-maker).

Start Your Search

Thanks to the Internet, searching for international jobs has become substantially more efficient than before computers became a ubiquitous career development tool. There are many, useful job search sites that list open positions and provide helpful information such as employment trends, salary comparisons, CV writing assistance, and career advice. The Internet is also an extremely useful tool for researching companies, their competitors, and specific industry information.

Networking should be an equivalently important component to your job search. Consider all of your networking sources, including college connections, professional or trade organizations, and personal contacts. Utilize online networking sites such as Linkedin and ZoomInfo to alert others of your job search and to receive potential leads.

Don’t hesitate to reach out to companies, recruiters, and hiring agencies in the countries that you’re targeting by calling them directly. Fortunately, with the use of an internet phone service such as MediaRing Talk, you can make free and low-cost PC to phone calls directly from your computer. Check out the article at http://www.techcareers.com/articles/five-strategies-for-finding-an-overseas-job-4285-article.html

It’s simply a fact that vacation travel often has a high environmental impact. Everything from air travel and cruising on a luxury liner to water and power usage at a hotel can dramatically expand one’s environmental footprint. Ironically, many individuals who have been bitten the hardest by the “travel bug” are also some of the most concerned about the environment. How can eco-friendly vacationers balance their wanderlust with being environmentally responsible? Here are five green travel strategies that minimize consumption while maximizing fun and adventure.

Steer Clear of Large Scale Tourism
Cruises and large resorts are among the most ecologically irresponsible options available to travelers. Cruise ships that often carry up to 3,000 passengers and crew members at one time generate copious amounts of sewage, solid waste, and bilge water that when released without proper treatment spill pathogens and toxic substances into the environment that can threaten human health and aquatic life. These vessels’ diesel engines also burn high sulfur content fuel that produces sulfur dioxide, carbon monoxide, and hydrocarbons, as well as particulates that add significantly to overall air pollution.

Like cruise ships, luxury and destination resorts cater to large volumes of vacationers and subsequently consume and waste significant amounts of energy and water. This can have a dramatically negative affect on local bio-systems and wildlife and quickly deplete natural resources of surrounding communities.

If a resort or cruise is the only option available, choose one that has a “green” program in place. Several large chains including Wyndham, Starwood, and Celebrity Cruises are a few that have taken proactive steps to reduce their emissions and increase their overall environmental responsibility.

Book Locally
Among the most obvious ways to plan an eco-friendly vacation is to work directly with local providers of tours, accommodations, and cultural activities who are concerned about the preservation of their local environments. Not only do these providers offer unique experiences for travelers that are reflective of the culture and landscape of their destination, they also provide the ability to support and empower local communities and their economies.

Prior to the development and growth of the Internet, there were very few options for researching and booking vacations. Most vacationers simply called their local travel agent to coordinate all of the details. The adventurous relied on travel guides. Fortunately, times have changed, and now travelers have a world of travel opportunities literally at their fingertips.

With the Internet being used in even the most remote locations of the world, local service providers are effectively promoting their offerings and communicate directly with potential customers looking for more responsible alternatives to the typical large hotels, tours, resorts, and activities. One company that specializes in connecting travelers with local services is www.stepuptravel.com. They provide a comprehensive travel classifieds site filled with unique activities and accommodations offered by local businesses. Categorized by destination, activities, and accommodations, the site offers detailed service descriptions, photos, reviews, and the ability to contact service providers online.

For those who feel more comfortable talking via phone with local providers prior to booking reservations, voice over internet protocol (VoIP) technology is a great way to call long distance for little or no cost. Mediaringtalk.com is one such provider that provides free PC to Phone and free PC to mobile calls to eight countries and extremely low rates for all other destinations. VoIP service is also ideal for making free calls while on vacation.
To read the article, go to http://www.off-gridliving.blogspot.com