Introduction
You have broadband internet connection at home or in office , you get Linksys/Sipura/Grandstream etc. SIP adaptors, or Xten/SJphone etc. SIP phone software, you are exciting about the low price broadband phone services like BroadVoice/VoicePulse/VoIPBuster/TelaSIP/Nikotel/HKBN/Gafachi etc., when you get everything paid and try to make a phone call, it doesn't work! After hard time working on this and that, finally you figured out, that your ISP or your country's internet backbone carrier blocks UDP 5060 port for the SIP calls!
Then this FREE SIP Outbound Proxy Service is for you!
How to use the service
Keep your original SIP settings, but, using the "Outbound Proxy Server" option in your SIP configuration, you can try any one of below settings which is working in your case (for example, if your ISP didn't block the UDP port 135, then use freesps.gcdns.com:135 as "outbound proxy"):
freesps.gcdns.com:53
freesps.gcdns.com:69
freesps.gcdns.com:80
freesps.gcdns.com:123
freesps.gcdns.com:135
freesps.gcdns.com:161
freesps.gcdns.com:443
freesps.gcdns.com:1433
freesps.gcdns.com:1812
freesps.gcdns.com:3389
freesps.gcdns.com:5900
freesps.gcdns.com:15345
freesps.gcdns.com:27888
freesps.gcdns.com:44899
FAQ
Q: How this free outbound proxy service works to bypass the ISP's blocking on SIP 5060 port?
A: Your ISP blocks 5060 UDP port which is famous port for SIP protocol, and 95% of broadband phone services are using SIP protocol, so in general the broadband phone can't be used in your ISP, because all SIP request messages sending to the broadband phone servers are dropped by your ISP. But, mostly, your ISP didn't block all UDP ports, they will open UDP ports like 53 (for DNS), 135, or any ports > 10000 for you. With the help of SIP outbound proxy server, your SIP message will send to the SIP outbound proxy server through this no blocking UDP Port, the outbound proxy server will then forward the SIP messages back to your broadband service providers' system.
Q: Will my SIP service password be exposed to third-party when using your free service?
A: No, SIP protocol encrypt the password into the MD5 string so no one can figure out your password;
Q: Will the VOIP calls' voice quality get affected by using your service?
A: No, our service is like a signal forwarder between you and your broadband phone provider, it doesn't interact with VOIP voice data, all the RTP packets are going through directly between you and your broadband phone provider. Plus, this service is running in one of the best data centers in the world, it connects to the several best internet backbones to guarantee the fastest connection to most countries in the world.
Q: I am behind the NAT router with private IP address, does this system work in my case to accept incoming calls?
A: YES
Q: I want to use it for commercial business, what is your service's reliability?
A: This is a FREE service for residential and profit-free office use. Running VOIP business through this FREE service is not guaranted of the service reliability, and is not allowed. However, you can use our another service which is dedicated to VOIP business applications, you just need pay a little but get a full solution for your own profitable VOIP business, please contact us for details.
Q: I have some questions, can I get any people to ask?
A: You could post the questions or suggestions in the FreeSPS forum http://freesps.s4.bizhat.com , also there have one wiki page introducing this service at here
Q: How to contact you regarding any issue of your service?
A: Our email address is: freesps at gmail dot com (change 'at' to @ and change 'dot' to . )