SIP Trunk Overview

A SIP trunk is a virtual telephone line offered by an Internet Telephony Service Provider (ITSP). Through a SIP trunk, users can make and receive calls over the internet.

Terminology

SIP: Session Initiation Protocol (SIP) is a multimedia communication protocol developed by the Internet Engineering Task Force (IETF), an application-layer control (signaling) protocol for creating, modifying, and terminating sessions with one or more participants.

ITSP: An Internet Telephony Service Provider (ITSP) is a provider of VoIP telephone service, also known as VoIP service provider.

SIP Trunk Types

Cloud Voice supports the following SIP trunk types:

SIP Register Trunk: Registration-based SIP trunk that uses username and password for registration with SIP providers.; Note: This type of trunk requires at least one DID number.

SIP Peer Trunk

IP-based SIP trunk that uses IP address and port of PBX for authentication.

Cloud Voice supports the following SIP peer trunks:

Peer Trunk (DID Based): The ITSP routes calls based on DID number.
Note: This type of trunk requires at least one DID number.
Peer Trunk (Port Based): The ITSP routes calls based on SIP registration port.
Note: Cloud Voice supports up to 5 port-based peer trunks.
Peer Trunk (Private Network): This trunk type can be used when the ITSP and PBX are in the same private network.

SIP Account Trunk: SIP Account Trunk is designed for connection between Cloud Voice and other devices. Cloud Voice will act as a VoIP account provider, the other device should register this account to connect to Cloud Voice.

SIP trunk creation methods

Create a SIP trunk by a template: Cloud Voice supports leading ITSP across the globe, you can use the pre-configured ITSP templates included in Cloud Voice to set up a SIP trunk quickly and easily. For more information, see Create a SIP Trunk from a Template.

Note: Check tested and supported ITSP from ITSP partner page.

Create a general SIP trunk

If your ITSP has not undergone an interoperability test by Cloud Voice, you can set up a general SIP trunk.

For more information, see the following topics:

SIP Trunk status


Status	Description
	Disabled.
	Unreachable.
	Registration failed. Authentication failed. Transport type inconsistent. Rejected.
	Authentication failed.
	Registering.
	Registered.
	Unmonitored.
	Busy. Maximum channels reached.