All Services Programming & Development System Administration $5/hr · Starting at $25 Asterisk, VoIP, VoIPSwitch, VOS3000, A2Billing About $5/hr · Ongoing Download Resume Asterisk, VoIP, VoIPSwitch, VOS3000, A2Billing Skills & Expertise VoIP 0 Reviews This Freelancer has not received any feedback. Browse Similar Freelance Experts VoIP ServicesCisco VoIP Services