You can communicate with your other devices connected directly to our servers by creating internal extensions for your sub accounts. This enable internal communications for users who don’t use a PBX but connect their ATA, Softphones and IP phones directly to VoIP.ms. For devices to communicate with each others by dialing extension, you’ll need to have them all registered to the same server. If you need further assistance with this, contact our support via live chat or send an email to [email protected].