Systems and techniques are provided for voice calling with a connected device that does not include a SIM card or telephone port. Outgoing audio data may be received at an embedded browser running on a connected device, may be sent using Web Real Time Communications (WebRTC) from the embedded browser to an integration layer running within the embedded browser, and may be sent from the integration layer to a border controller for a voice call carrier over a Session Initiation Protocol (SIP) connection according to Secure Real Time Transport Protocol (SRTP). Incoming audio data may be received at the integration layer from the border controller for the voice call carrier over the SIP connection according to SRTP, may be sent using WebRTC from the integration layer to the embedded browser, and may be sent from the embedded browser to an audio output of the connected device which may output audio.