Support links to various switch vendor platforms:
Asterisk - Support Forum http://forums.asterisk.org/
3CX - Support Forum http://www.3cx.com/forums/
Avaya - Support Forum http://support.avaya.com/css/appmanager/public/support
Elastix - Support Forum http://www.elastix.org/index.php/en/component/kunena/
Trixbox - Support Forum http://fonality.com/trixbox/forum
Grandstream - Support Forum http://forums.grandstream.com/forums/
Cisco - Support Forums http://www.cisco.com/cisco/web/support/index.html
FreePBX - Support Forum http://www.freepbx.org/forums
Talkswitch - Support Forum http://www.talkswitch.com/us/en/support/
AudioCodes - Support http://www.audiocodes.com/support
Voipswitch - Support http://www.voipswitch.com/
IPsmarx - Support http://www.ipsmarx.com/Support.html
Huawei - Support http://support.huawei.com/support/
Sonus Networks - Support http://sonusnetworks.force.com/PortalLoginPage