Sony officially announced it for the Slim, the Noobz team officially make it happen — for both Fat and Slims! It’s beta software so please report any problems. See readme.html to get started.

Fanjita notes the audio quality needs some work, the interface needs a makeover, and video calls aren’t working quite yet. Nonetheless it’s usable and demonstrates pure awesomeness. Source code is also available for homebrew developers to advance on. Kudos team!

“Furikup” highlights:

• It’s free software — in both the beer, and speech senses.
• You can use it anywhere in the world, subject to signing-up to a suitable local SIP-based voice-over-IP provider and being near a usable wifi access point. e.g. with SIPGate, in the UK, you can call to your PSP from any standard phone (landline or cellphone) for just the standard local call cost, and from PSP to another SIP phone (another PSP or a PC) for free.
• It runs on both slim and fat PSPs.
• It uses open standards, for maximum compatibility with other phone systems.
• You can use a Go!Cam (Chotto Shot), Talkman microphone, or SOCOM-style headset for audio input. (And even if you don’t have any of those, you can still send audio from a WAV file in a pinch).

This program allows you to use your PSP as a phone, using Voice-over-IP (VoIP) technology. We got a bit bored waiting for Sony to release their PSP phone offering, so we thought we’d do it for them. Such is the freedom of homebrew.

You can use your PSP to make and receive calls to and from other PSPs, or to other VoIP users, or even to standard landline and mobile telephones, depending upon the VoIP service that you use. Calls are generally free, or at least cheaper than standard landline rates – again, depending upon your VoIP provider.

This is an initial release, currently supporting audio-only calls, and with a very basic user interface. But it works, and that’s the main thing.

The VoIP engine is implemented as a standalone PRX, with a well-defined interface. As well as using our simple phone application, we encourage other developers to make use of this technology for other applications. We’re sure that someone can write a nicer user interface than ours, so please do. There’s also scope for plenty of other uses – such as a CFW plugin for calls within the XMB, or teamtalk-style add-ons for games etc. Go wild!

Download: Furikup – PSP SIP Phone v0.1 (source code included)

- source: noobz.eu