VoIP startup TringMe has launched a Facebook application that lets users make calls from the social network using its Flash-based web phone for browsers. The app also lets you embed widgets to your profile for your Facebook friends to call or SMS you.

The app has much of the functionality that a regular VoIP app like Skype has. TringMe’s app lets users set up caller-id, send SMS messages from Facebook, lets callers leave voicemails that the users can access and lets you add TringMe widgets to your profile that let friends and visitors call or SMS you from that page, which seems to be the most appealing feature of the app.

And if you have a TringMe account, you can integrate your account with Facebook. Of course, you have to buy credits to use the application, which range from $5 to $100 worth of credits, bought via PayPal. Facebook also has a similar Skype-based app called SkypeMe. that lets you Skype your friends.

TringMe also recently launched a demo of a widget that now allows a user the ability to make a VoIP call from Microsoft Silverlight applications. Silverlight doesn’t allow access to a microphone, thus restricting VoIP calls, so TringMe used a backdoor Flash widget to access the microphone.

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Like Skype, you pay really low rates for calls to regular phones, while PC calls are free. GizmoCall supports video calls as well. And one nice feature is that it can turn any phone number into a link, like this test number.

Gizmo has opened up its APIs for developers to add calling features to their apps compare to the APIs from Ribbit or Ringful). GizmoCall phones are also embeddable:

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Still, you are really asking to be distracted if you turn this feature on. Or disappointed. What if you put the badge on your site and no one wants to chat?

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The TringPhone, as it is called, really is more of a technology demonstration than a full-fledged service. TringMe is hoping to license the technology to VOIP providers and help make Web-based telephony as simple as visiting a Web page. It already works with any existing account on a SIP-based phone service, and can be configured for pretty much any VOIP provider. I tried out a demo of the TringPhone, and it completed a call to my U.S. cell phone. Starting later today, the TringPhone should be available on TringMe’s Website.

The startup is also working on a mobile VOIP service that will let you make SIP calls from your phone’s browser over a 3G data network. That one probably won’t be based on Flash.

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Nearly every VOIP related startup has their own click-to-call widget, Jajah, Jangl, Jaxtr, and even GrandCentral. These widgets let you easily and sometimes anonymously set up a call with friends over the web. They’re very useful and come packed with features like voicemail and texting. However, each of these services connects phones to phones, which still eats away at your mobile minutes while you’re talking to that business contact or MySpace hottie.

TringMe offers a bit more flexibility. Callers can ditch their phone and call directly through their Flash widget to your mobile phone, landline, and GTalk (Yahoo and Skype coming soon). All they need is a microphone and one click. Although they’re still in private beta, you can try the demo widget to the right for an idea of the experience.

Similar to the other services, your phone number is kept private and the calls are free (now’s the time for that overseas call). You can also set the widget to just receive voicemails, which are emailed to you, saved on your standard mailbox, or recorded and played back in GTalk. There is one major drawback, though. Since there is no virtual phone number involved, callers have to be at a computer and can’t call you while they’re on the go.

Naturally such an easy and anonymous calling service is susceptible to abuse, and I don’t see any countermeasures in place to keep out prank calls and telemarketers. The other services have verified phone numbers and white/black lists to keep abuse to a minimum. I expect TringMe will have to incorporate similar controls to make people more comfortable with using the widget.

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