Hi,
I was workin within VoIp switch development so i think i can help a little bit in this topic.
First of all advantages of VoIP vs standard telephony:
- Voip is really cheaper than standard telephony (indeed pc-pc is free).
- VoIp will be provided together with fancy extras. Such as Video and so on.
- Voice can be compressend into data with most accuracy than standard telephony. I am sure VoIp quality will be better in a few time (if not already) than standard telephony.
Disadvantages:
- Operators and mobile developers are still on the path to support VoIP in huge dimension. However PTT (push to talk is already workin in the states) is already a kind of VoIP service since it uses SIP too to intiates the session.
If you want to give it a try. I will give you some steps to follow:
- go to www.xten.com and download the X-Lite a nice Vo-ip phone.
- register to sipphone.com to get a sip uri. That will be the equivalet to your telephone number.
- Configure X-lite that can be quite tedious but there are some tutorials on the net. I will create myself a tutorial and post it here one of these days.
If you want to go to the easiest way. Try skype.com. They do not use SIP (Session intiation protocol). Instead they use a propietary protocol which does not allow you to speak with no-skype users but between Skype ones it works really well.
And there is also babble.net which i will try in the next weeks. They say is cheper than Skype
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