URL

http://freesps.googlepages.com

What's this?

A Free SIP Outbound Proxy Service, that bridge SIP signal messages between SIP client and SIP proxy server through UDP port other than the standard 5060, by this to bypass the ISP's blocking on broadband phone service.

How it works?

SIP outbound proxy is the part of the SIP protocol standard defined in RFC 3261

The outbound proxy server's IP is freesps.gcdns.com, there have up to 12 opened UDP port numbers for use, just pick up one port which works in your ISP's scenario.

Here is the list of all running UDP ports for this service:

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

How to setup the SIP client?

You don't need touch any existing settings your broadband phone service required, but just touch the outbound proxy settings in your SIP devices.
When you enabled Outbound Proxy, mostly you don't need enable STUN support in your SIP client any more.

• Linksys/Sipura boxes

 Use Outbound Proxy: yes
 Outbound Proxy: freesps.gcdns.com:53
 Use OB Proxy In Dialog: yes

• Grandstream boxes

 Outbound Proxy: freesps.gcdns.com:53

• X-Lite Softphone

 Out Bound Proxy: freesps.gcdns.com:53
 Use Outbound Proxy: Always

Have questions or suggestions?

Visit the FreeSPS forum to discuss at http://freesps.s4.bizhat.com