FreePBX help and Api

I am using Ringlogix but thinking of “rolling my own”
Must haves for system:
• Support of SMS
• similar Mango voice
• easy API with open dental and patient express.
• Voip innovations
• Click to call with open dental
• Install of freepbx on a virtual server
• Configuration of freepbx on a test account
Will pay for consultant plan and may use you for starting company.