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This is a job for developers with experience in PHP and Asterisk AGI . My Centos server is running Asterisk 1.8, Freepbx, Hylafax and a platform for billing Voip use coded in PHP taken from an OPEN SOURCE resource. But I noticed that solution had some bugs and I require also some customizations. (it is not a2billing)
Send me your bid and message of your experience and I will provide you more details of the requirement.
Depending of quality and promptness, I will use your services for additional future support.