I cannot get Twilio Elastic SIP Trunking to work as a SIP provider for my 3CX install (v15, linux). I have 3CX setup and working with Flowroute and it has been working fine for over a year. We want to move our SIP trunking to Twilio Elastic SIP Trunking, because of the price and the extensive development platform. I have been following the guide here: https://www.twilio.com/resources/images/docs/3CX-Twilio.pdf I can receive inbound calls but run into 2 issues: Calls inbound only have one-way audio. I can hear the caller but the caller cannot hear me. Outbound calls result in "403 Forbidden" when using just IP Based Authentication and "Destination is not reachable" when using Account Based Authentication. Thanks in advance!