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A2Billing Vendor Documentation
A2Billing Official Documentation is located here:http://www.asterisk2billing.org/documentation/
Elastix Vendor DocumentationElastix Official Documentation is...
FreePBX Vendor DocumentationFreePBX Official Documentation is located here:http://www.freepbx.org/support/documentation
Official Asterisk DocumentationAsterisk Official Documentation is here: http://www.asterisk.org/community/documentation
Official Freeswitch DocumentationFreeswitch Official Documentation is here: http://wiki.freeswitch.org/wiki/Documentation
Official FusionPBX DocumentationFusionpbx Official Documentation is here:...
Official Kolmisoft DocumentationKolmisoft Official Documentation is here: http://wiki.kolmisoft.com/index.php/MOR_Manual
Official PBX in a Flash DocumentationPBIAF Official Documentation is here: http://pbxinaflash.com/docs/
Official Vicidial/Goautodial Documentation and ManualGoautodial Official Documentation is here:...
TrixboxTrixbox manual can be found here: asterisk.ru/store/files/TrixboxMadeEasy.pdf