How To Set Up Free SIP Calling On Any Device

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Session Initiation Protocol (SIP) allows one device to find another and establish a connection over the internet. It’s a protocol that initiates a session — other protocols are responsible for transferring data.

You can use SIP calling for voice calls, texting, video conferencing, and online messaging. Businesses can use SIP trunking to enable all of these channels for an entire office.

For SIP calling, all you need is a stable internet connection and a device with speakers and a microphone.

You may be familiar with Voice over Internet Protocol (VoIP), which relies on SIP and lets you make phone calls over the internet instead of the Public Switched Telephone Network (PSTN). Free VoIP phone services let you start ...