SIP Trunking Basics

Simple and easy to understand

Unlimited
Unlimited SIP Trunks

SIP trunks are sold by the channel, with each channel handling one incoming or outgoing phone call, much like a traditional telephone line. Customers that opt for Unlimited SIP trunks pay one low monthly fee per channel for all of their calls to the lower 48 US states and much of Canada. This gives customers a predictable monthly fee regardless of how many minutes they spend on the phone.

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Scalable
Scalable SIP Trunks

With scalable SIP trunk pricing, also known as metered SIP trunking, customers get blocks of minutes with an unlimited number of SIP channels. Customers can upgrade to a bigger bundle at any time and provisioning is instantaneous.

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DID
Direct Inward Dial (DID)

A DID or Direct Inward Dial is a dedicated telephone number that allows your customers to receive calls directly via their VoIP IP PBX or analog PBX extension. SIPTRUNK.com has one of the largest banks of DIDs from all area codes across the United States and Canada making it easy to provide local numbers for all locations. Or bring (port) your telephone numbers with you.

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DID
Toll Free Numbers and Service

Toll free numbers add credibility and professionalism to any business. Offer your customers the ability to port their existing toll free number or add new toll free numbers. We have a wide selection of umbers including 800 numbers. Inbound toll free calling is available at low monthly rates.

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DID
SimpleFAX™ over IP Service

Faxing remains an important part of business communications for many industries, yet reliable, IP based fax service has been a challenge. Until now. Our SimpleFAX™ over IP service uses a small device and store-and-forward technology to securely send faxes over an IP connection with a 100% success rate.

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What is SIP Trunking? - Some Basic Info

SIP trunking is a method of delivering telephone and other unified communications services over the internet. It works with a SIP-enabled PBX (private branch exchange). SIP stands for Session Initiation Protocol and it is the communications protocol for signaling and controlling multimedia communication sessions. SIP trunking replaces traditional telephone lines or PRIs (Primary Rate Interface).

Before SIP, voice calls were carried over the Public Switched Telephone Network (PSTN), the copper phone lines we traditionally associate with the “telephone.” The PSTN is a physical, circuit switch network, which requires a physical connection between two points in order for a call to take place.

SIP trunks, on the other hand, are virtual phone lines that allow you to make and receive phone calls over the internet to anyone in the world with a phone number whether they are using VoIP or the PSTN. SIP trunks utilize a packet switch network, where your voice calls are broken down into digital packets and routed across a network to its final destination.

SIP Channels

Each SIP trunk can support a number of SIP channels. A SIP channel is the capability to support one incoming or outgoing call. You can think of SIP channels as the lanes for your highway. Each call takes up exactly one lane. Because a SIP trunk can hold an unlimited number of channels, you only need one SIP trunk. The number of channels you need will depend on how many concurrent calls your business tends to make. SIP channels are sometimes called sessions, lines or concurrent calls. They are similar in practice to a traditional telephone line.

SIPTRUNK offers your customers the option of subscribing to a set number of SIP channels with an unlimited number of minutes in the lower 48 US states and most of Canada for a monthly per channel fee, or they can choose a bundle of minutes that can be used over any number of channels.

SIP trunks, on the other hand, are virtual phone lines that allow you to make and receive phone calls over the internet to anyone in the world with a phone number whether they are using VoIP or the PSTN. SIP trunks utilize a packet switch network, where your voice calls are broken down into digital packets and routed across a network to its final destination.

SIP vs. VoIP (Voice over Internet Protocol)

Although SIP and VoIP are sometimes used interchangeably, they are not the same thing. The term VoIP stands for Voice Over Internet Protocol. It is a broad term that covers any phone calls made over the Internet. It includes a group of protocol technologies of which SIP is an example. In short, SIP is one of the specific protocols that enable VoIP.