How does a Softphone work?

Can you answer jobless’s question about VoIP?:

How exactly does a softphone work, from PC to a fixed-line/mobile?
I understand the requirements to make a call using a Softphone, but I would like to get a clear picture of the way it travels, how the IP address comes into picture, how is the destination’s phone number identified by the Softphone, basically how this transfer is made from digital packets to analog packets.

Kindly please help !

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Is there a softphone available to make and receipt VOIP calls over my Blackberry Curve?

Can you answer ShadyCreek’s question about VoIP?:

I want to be able to make and receive VOIP calls over my Blackberry. I also want a VOIP phone number. Is there a service out there that can do this?

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What voip providers allow you to keep your existing phone number?

Can you answer blueberry’s question about VoIP?:

I really wanted to use magicJack because it seems easy enough and I’ve heard so much about it, but it’s been over 1 to 2 years since they promised to offer the ability to keep your phone number…and they still haven’t.

Anyone have any recommendations for a voip that is easy to install, has great call quality, no problems with emergency calls (911 can locate you immediately), etc.?

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