Ok, i have found another idea to make free calls, simplest that can be, but it needs some money for first investitions. Another step-by-step instruction for newbies. This info for free to all, you can publish it in your sites. I just put own work to world's computer comunity pool. (Sorry for my english :))
Gizmo+VoIP adapter/IP telephone
* Gizmo (www.gizmoproject.com) is Skype-like messenger with all skype-like functions but uses free SIP protocol (Skype uses closed own protocol). Schematics of Gizmo: you have Gizmo messenger it connects to SIP server and operates with you calls to another account, but skype uses P2P technology, it doesn't need a server - it is an advantage of skype, but disadvantage is - skype hardware must make P2P operations, in most cases it use computer for it. All you need for Gizmo is Gizmo messenger or SIP-based Hardware (all IP thones Grandstream, SNOM etc, VoIP adapters like Sipura, Linksys PAP2, Linksys WRT54GP2..). Do you understand what it mean? :) You can talk without computer!! No more big electricity bills :)
I have Wi-Fi router/VoIP adapter Linksys WRT54GP2 and i will tell you how to configure it to make free calls to another Gizmo abonent.
| Linksys WRT54GP2 ~$130 4-in-1 : router, 3 port switch, Wi-Fi b/g access point, 2 port VoIP adapter |  |
It is very simple.
Make Gizmo account:
1. Download Gizmo http://www.gizmoproject.com/download.php
2. Make an account
3. Log in
4. Press Edit my profile
5. Get your SIP number. It is your real Gizmo number, you can call and you can be called to it.
6. Ok, open your router/IP phone admin page.. in Linksys WRT54GP2 it is 192.168.15.1, in Grandstream another address and put this info to rows:
| SIP Proxy: | proxy01.sipphone.com:5060 |
| STUN server: | stun01.sipphone.com:3478 |
| Username: | Your SIP (without stripes) number (or dial ** in Gizmo to found it) |
| Password: | Your Gizmo password |
| Codecs: | iLBC, GSM, g711a, and g711u choose one |
7. You must put same codecs on both sides. If your friend has iLBC codec, but you configured as GSM you can hear error message about codecs mismatch, i can't call to Gizmo messenger from my VoIP adapter, only Adapter-to-Adapter.. i think messenger uses iLBC, but Linksys doesn't have it.. so codec mismatch
8. Make a call to your friend by SIP number
9. If all is OK - congratulations! You can make free calls to your friend or mom :)
* you should have minimum 64 Kbit/sec upload/download to make comfortable calls