Greetings. I had to read some thigs about SER. I like configure a sip server but I don't know that I need. I like to take calls (pc-phone)(ip phone-phone) from my customers, and resend them to a voip provider. and I need a billing system (preaid), to control my customers, I need to configure several rates for calls. Can somebody tell me that I need to make this? I'm sorry but my english isn't very well. (I speak spanish) Atte, Felipe Solano Explore the seven wonders of the world Learn more! _________________________________________________________________ News, entertainment and everything you care about at Live.com. Get it now! http://www.live.com/getstarted.aspx