Thursday, June 12, 2008

VoIP for dummies

Using voice over IP, from any computer or telephone (IP phone or regular phones with ATA) connected to the internet with a broadband connection (though dial ups can still make calls) can call another computer or phone at a fraction of usual cost, or absolutely free. In other words VoIP can turn a standard Internet connection into a way to place free phone calls or almost free.

The main idea is to use a software like softphones or hardware like IP phones and to make a phone call bypassing the phone company together with its charges.

VoIP is slowly replacing traditional voice communications and access to it can take place today from most any kind of telephony device whether physical or digital. Traditional telephones can easily access low-cost VoIP services like what Onesuite voip has to offer while maintaining their telephony hardware intact.

Even mobile phones can now access VoIP telephony services from multiple providers making it possible for users to save significantly on long-distance and international calls and taking greater advantage of new complimentary services like conferencing, scheduling, recording and more.

Voip works by taking the voice and sampling it. Most of us have recorded our voice to a digital device be it a computer, a mobile phone or a digital dictaphone. You can even get applications for iPODs to record your voice. The voice samples are converted into data and then stored on the device to be played back at a later date. V0IP works in the same way, taking the voice, sampling it and converting it into binary data. The different is that data isn't stored locally but the samples are transferred them via the network to the recipient at the other end.

In order for the data to flow smoothly from one point to the other the samples are compressed with a CODEC and sliced into packets or smaller samples. These packets are then pulsed across the network and reassembled at the other end, decompressed and played backed. The whole process is so quick that the users do not notice the process taking place. If the process does become slowed down then jitter can take place. The voice or video then becomes choppy or glitch ridden. In order to over come the problem a fast Ethernet network dedicated to voip improves the flow of data.

There are two major types of equipment used for voip transmissions. The first is the soft phone, this is a system that utilizes a computer with the addition of a microphone and either headphones or speakers. The computer has software installed that acts as the gateway to the network providing the sampling, CODECS and the steaming of the data.

The vast majority of Skype users use soft phone route when accessing the service. Although you can use handsets these are still pseudo soft phones as Skype cannot be used with voip analogue telephone adapters (ATAs) and therefore they are restricted to the Skype network which kinda disadvantage to most users.

The other devices for using a voip network are unsurprisingly called hard phones. These are stand alone devices that look like a regular phone but instead of a phone jack they have an internet cable that can be plugged directly into the network.

Wednesday, June 11, 2008

Knowing VoIP

VoIP (Voice Over Internet Protocol) or IP telephony is rapidly changing the way we communicate. Aside from being a lot more cheaper than traditional phones, certain features such as portability makes it attractive for residential and business owners alike. But as with all modern technologies, VoIP has its own disadvantages. These flaws are minor, and solutions are being worked out as you read this. One thing is clear, though. The advantages of VoIP clearly outweighs its disadvantages.

VoIP is dependent on bandwidth. Even the best of the best ISP (Internet Service Provider) experience technical issues. Since VoIP uses your Internet connection, it is bound to be affected. If your Internet is down, you will not be able to make or receive a call. If your connection is exceptionally slow, then expect low voice quality. A user might also encounter problems if he makes or receives a call while streaming videos or audio, or while downloading a large amount of data. If bandwidth is the problem, then it might be time to change your provider. Search for a more reliable and stable ISP and don't forget to ask your friends for referrals.

Voice quality issues. This has been a problem attributed to VoIP calls ever since its birth. Static noise, echoes, and delays are a common complaint of users. There are a number of factors that affects VoIP's voice quality: internet connection, the hardware in use, the VoIP provider, distance of call, and many more. It is best to try out the service before committing to it. Also, try different combinations of hardware until you get the results that you want.

VoIP needs power. Unlike traditional phones, VoIP needs electricity to work. You have to plug in your modem, ATA, and other VoIP hardware for you to be able to make and receive a call. You can not use your phone if there is a power interruption. Emergency power generators might be a little far-fetched for a regular home to have, but if you are running a business then you should probably get one.

Emergency calls. If you use traditional phones to dial 911, it will be diverted to a call center nearest to you where the operator has the ability to see where exactly you are calling from. Using VoIP, there is no way to trace where your call is coming from. In addition, if the emergency involves a power interruption then you will not be able to make a VoIP call. There is a new service called E911, which a lot of VoIP providers are offering. It is for your best interest to ask your provider regarding this and other emergency calling issues.

To be on the safe side, having a traditional phone aside from the VoIP phone is a good idea. It will also help if you could write down individual phone numbers of emergency facilities (local police, fire station, hospitals, etc.) and post it near your phone.

Keep in mind that these are just minor inconveniences and every passing day VoIP is advancing. Its advantages and benefits are too many to pass up. Soon it will replace traditional phones as the communication technology of choice.

From Hero to Zero

Lewis Hamilton went from hero to zero after crashing into Ferrari's world champion Kimi Raikkonen in a bizarre pit-lane pile-up at the Canadian Grand Prix.

Lewis, a near champion last year (lost by a point) made a silly stupid mistake by ramming to Kimi Raikonnen in the pit lane. The 23-year-old McLaren driver, who covered himself in glory by winning in Monaco two weeks ago, kissed goodbye to his championship lead with the most embarrassing moment of his fledgling Formula One career.

Hamilton, who was branded "stupid" by Raikkonen, was handed a 10-place grid penalty for shunting the world champion out of the Montreal race in a pit-lane collision last Sunday.

Leading the race from pole position at the scene of his first grand prix victory last year, Hamilton ploughed into the back of Raikkonen's stationary Ferrari after they pitted on lap 20 while the safety car was deployed.

The Finn had stopped at the red light at the end of the pit lane, with BMW Sauber's Polish driver Robert Kubica waiting alongside for the all-clear to rejoin the race. Lewis who came in first was probably mad coming out third after Kimi and Robert and eager to take back the position lost.

Hamilton failed to brake in time, with German driver Nico Rosberg then adding to his misery by shunting the McLaren with his Williams.

"We got into the pitstop, it wasn't a great stop and I saw the two guys in front of me and they were battling in the pit lane," Hamilton told Britain's ITV television.

"I was obviously trying to make sure I didn't get involved with those guys. I saw the red light but by the time they had stopped and I had seen the red light it was a bit late," he continued.

"It's a lot different if you crash into the wall and you are angry with yourself. It's not like that. I apologise to Kimi if I've ruined his race but that sort of thing happens."

The incident happened at the exit from the pit lane after the first round of stops and took both drivers out of the race. Raikkonen, whose car was stationary at a red light signal, said: "My race was ruined by Hamilton's mistake.

"Obviously, anyone can make mistakes - as I did two weeks ago in Monaco [when Raikkonen shunted Force India's Adrian Sutil out of the race].

"It's one thing to make a mistake at 200 miles per hour but another to hit a car stopped at a red light."

He added: "If I go 300 kph, lose control and hit somebody it is natural. But if there is a pit-lane speed limit and two cars stopped and you hit them, it is stupid. I saw a red light and chose to stop, someone else saw a red light and chose not to.

"I am not angry - because that doesn't achieve anything and does not change my result! I am unhappy, because I had a great chance of winning."

Whitmarsh agreed that Ferrari and Raikkonen were the "innocent victims". And he explained that the pitlane had been unusually congested, with drivers pitting during the safety car period, and Hamilton had to monitor the cars ahead of him as well as the keeping an eye on the lights.

But he said McLaren had never considered protesting the penalty. "We're going into France with a 10-place penalty for Lewis so that will clearly affect our approach. Without giving too much away, I suspect he'll run a little bit longer in the first stint than would otherwise have been the case," he said. "We haven't modelled it yet, but intuitively that's what we'll probably do."

Wednesday, May 21, 2008

American Idol: and the winner is...David!!!



Cook that is. It doesn't came as a suprise but I was hoping David Archuleta could pull this one off. Cook is already a celebrity and almost guaranteed a success even without the Idol trophy but Archuleta is the underdog here and is not as Youtube famous as Cook. Anyhow, the 12 million voters placed their bets on Cook.

Friday, May 16, 2008

Earthquake in China!!!

First there were tornadoes in U.S. then Cyclone in Myanmar now a powerful 7.9 Earthquake in China that claims 10,000 lives and thousands more missing.

A powerful earthquake toppled buildings, schools and chemical plants Monday in central China, killing more than 10,000 people and trapping untold numbers in mounds of concrete, steel and earth in the country's worst quake in three decades.

The 7.9-magnitude quake devastated a region of small cities and towns set amid steep hills north of Sichuan's provincial capital of Chengdu. Striking in mid afternoon, it emptied office buildings across the country in Beijing and could be felt as far away as Vietnam.

Snippets from state media and photos posted on the Internet underscored the immense scale of the devastation. In the town of Juyuan, south of the epicenter, a three-story high school collapsed, burying as many as 900 students and killing at least 50, the official Xinhua news agency said. Photos showed people using cranes, mechanical hoists and their hands to remove slabs of concrete and steel.

Buried teenagers struggled to break free from the rubble, "while others were crying out for help," Xinhua said. Families waited in the rain near the wreckage as rescuers wrote the names of the dead on a blackboard, Xinhua said.

Parents of the dead students built makeshift religious altars at the site, resting the corpses on any available piece of plywood or cardboard, and burning paper money and incense in a traditional honor for their child in the afterlife, according to NPR's Melissa Block.

The earthquake hit one of the last homes of the giant panda at the Wolong Nature Reserve and panda breeding center, in Wenchuan county, which remained out of contact, Xinhua said.

In Chengdu, it crashed telephone networks and hours later left parts of the city of 10 million in darkness.

"We can't get to sleep. We're afraid of the earthquake. We're afraid of all the shaking," said 52-year-old factory worker Huang Ju, who took her ailing, elderly mother out of the Jinjiang District People's Hospital. Outside, Huang sat in a wheelchair wrapped in blankets while her mother, who was ill, slept in a hospital bed next to her.

Xinhua reported 8,533 people died in Sichuan alone and 216 others in three other provinces and the mega-city of Chongqing.

Worst affected were four counties including the quake's epicenter in Wenchuan, 60 miles northwest of Chengdu. Landslides left roads impassable Tuesday, causing the government to order soldiers into the area on foot, state television said, and heavy rain prevented four military helicopters from landing.

Wenchuan's Communist Party secretary appealed for air drops of tents, food and medicine. "We also need medical workers to save the injured people here," Xinhua quoted Wang Bin as telling other officials who reached him by phone.

To the east, in Beichuan county, 80 percent of the buildings fell, and 10,000 people were injured, aside from 3,000 to 5,000 dead, Xinhua said. State media said two chemical plants in an industrial zone of the city of Shifang collapsed, burying hundreds of people and spilling more than 80 tons of toxic liquid ammonia.

Though slow to release information at first, the government and its state media ramped up quickly. Nearly 20,000 soldiers, police and reservists were sent to the disaster area.

Disasters always pose a test for the communist government, whose mandate rests heavily on maintaining order, delivering economic growth, and providing relief in emergencies.

Pressure for a rapid response was particularly intense this year, with the government already grappling with public discontent over high inflation and a widespread uprising among Tibetans in western China while trying to prepare for the Aug. 8-24 Beijing Olympics.

"I am particularly saddened by the number of students and children affected by this tragedy," President Bush said in a statement.

International Olympic Committee President Jacques Rogge sent his condolences to President Hu Jintao, adding: "The Olympic Movement is at your side, especially during these difficult moments. Our thoughts are with you."

Premier Wen Jiabao, a geologist by training, called the quake "a major geological disaster," and traveled to the disaster area to oversee rescue and relief operations.

"Hang on a bit longer. The troops are rescuing you," Wen shouted to people buried in the Traditional Medicine Hospital in the city of Dujiangyan, on the road to Wenchuan, in comments broadcast by CCTV.

"As long as there was a slightest hope, we should make our effort a hundred times and we will never relax," he said outside the collapsed school in Juyuan.

The quake was the deadliest since one in 1976 in the city of Tangshan near Beijing that killed 240,000 — although some reports say as many as 655,000 perished — the most devastating in modern history. A 1933 quake near where Monday's struck killed at least 9,000, according to geologists.

Monday's quake occurred on a fault where South Asia pushes against the Eurasian land mass, smashing the Sichuan plain into mountains leading to the Tibetan highlands — near communities that held sometimes violent protests of Chinese rule in mid-March.

Much of the area has been closed to foreign media and travelers since then, compounding the difficulties of getting information. Roads north from Chengdu to the disaster area were sealed off early Tuesday to all but emergency convoys.

In Chengdu, the region's commercial center, the airport closed for seven hours, reopening only for emergency and a few outbound flights. A major railway line to the northeast was ruptured, stranding about 10,000 passengers, Xinhua said. Although most of the power had been restored by nightfall, phone and Internet service was spotty and some neighborhoods remained without power and water.

Nervous residents spent the night outside, some playing cards or heading to the suburbs. State media, citing the Sichuan seismology bureau, reported 313 aftershocks.

"Traffic jams, no running water, power outs, everyone sitting in the streets, patients evacuated from hospitals sitting outside and waiting," said Ronen Medzini, an Israeli student in Chengdu, via text message.

When it hit shortly before 2:30 p.m., the quake rumbled for nearly three minutes, witnesses said, driving people into the streets in panic.

"It was really scary to be on the 26th floor in something like that," said Tom Weller, a 49-year-old American oil and gas consultant staying at the Holiday Inn. "You had to hold on to something like that or you'd fall over. It shook for so long and so violently, you wondered how long the building would be able to stand this."

While most buildings in the city held up, those in the countryside tumbled. On the outskirts of Chongqing, a school collapsed, killing at least five people. Residents said teachers kept the children inside, thinking it was safer.

The city of Mianyang ordered all able-bodied males under 50 to take water and tools and walk or drive to Beichuan, where most of the buildings had collapsed.

State TV broadcast tips for anyone trapped in the earthquake. "If you're buried, keep calm and conserve your energy. Seek water and food, and wait patiently for rescue," CCTV said.

Although initially measured at 7.8 magnitude, the U.S. Geological Survey later revised its assessment of the quake to 7.9. Its depth — about six miles below the surface, according to the USGS — gave the tremor such wide impact, geologists said.

The earthquake also rattled buildings in Beijing, 930 miles to the north, causing evacuations of office towers. People ran screaming into the streets in other cities, where many residents said they had never felt an earthquake.

In Beijing, where hundreds of thousands of foreign visitors are expected for the Olympics, stadiums, arenas and other venues for the games were undamaged.

Li Jiulin, a top engineer on the 91,000-seat National Stadium — known as the Bird's Nest and the jewel of the Olympics — was conducting a site inspection when the quake struck. He told reporters the building was designed to withstand a 8.0 quake.

"The Olympic venues were not affected by the earthquake," said Sun Weide, a spokesman for the Beijing organizing committee. "We considered earthquakes when building those venues."

Some 660 miles to the east in Anhui province, chandeliers swayed in the lobby of the Buckingham Palace Hotel. "We've never felt anything like this our whole lives," said a hotel employee surnamed Zhu.

The massive Three Gorges dam, the world's largest about 350 miles to the east of the epicenter, was not affected, according to the information office of State Council Three Gorges Construction Committee. The area around the enormous dam remains increasingly precarious as rising waters in the reservoir have led to landslides.

Premier Wen, after arriving in Chengdu, traveled to Dujiangyan, near the collapsed high school. On his plane, he appealed for people to rally together.

"This is an especially challenging task," state TV showed Wen saying, reading from a statement. "In the face of the disaster, what's most important is calmness, confidence, courage and powerful command."