A SIP Profile is a SIP user account that contains all of the configuration and user data for your Skype Connect™ service.
You can create multiple SIP Profiles if your PBX can accept more than one, or if your company owns multiple SIP-enabled PBXs.
What is an SIP account?
SIP is a protocol that gives you a unique identification (a SIP number or address) on the Internet that you can use as a phone number or email address to make and receive voice calls for free to any other SIP user worldwide, or for cheap to any other landline or mobile user.20 Feb 2019
What is SIP used for?
Session Initiation Protocol (SIP) is a signaling protocol used for initiating, maintaining, modifying and terminating real-time sessions that involve video, voice, messaging and other communications applications and services between two or more endpoints on IP networks.
What is SIP Trunking and how does it work?
SIP Trunking Explained
That is exactly what an SIP trunk does; it acts as a virtual connection between an organization and an ITSP either through lines that link SIP trunks to other IP traffic, or through the Internet via a Virtual Private Network (VPN). Also, SIP Trunks make the recovery of files easier.