I'm looking for a tech who already has completed a Ringless Voicemail drop system. We will target users in US only so will calling 10-digit US phone numbers. We would ideally prefer some open source technologies to be used with it like Twilio, or FreeSwitch etc..If you Already have completed a Ringless voicemail drop system please bid. Please include the past project info.
Asterisk PBX, Telecommunications Engineering, VoIP