When it comes to VoIP protocols, there are a few options to choose from. In this blog, we’ll go over the most popular VoIP protocols and help you decide which one is right for your business.

VoIP Protocol: How to Choose the Right One

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There are three primary VoIP protocols in use today: SIP, H.323, and Skype for Business/Lync. Each has its own strengths and weaknesses, so choosing the right one depends on the needs of your business.

SIP (Session Initiation Protocol) is the most popular VoIP protocol, and it is used by the majority of VoIP providers. SIP is a flexible protocol that can be used for both IP PBX systems and hosted VoIP solutions.

H.323 is an older VoIP protocol that was developed by the International Telecommunication Union (ITU). H.323 is not as common as SIP, but it is still used by some businesses, particularly in Asia.

Skype for Business/Lync is a proprietary VoIP solution from Microsoft. Skype for Business/Lync can be used as an on-premises IP PBX system or as a cloud-based VoIP service.

The Different Types of VoIP Protocol

When it comes to VoIP, there are a few different protocols to choose from. The most popular ones are H.323, SIP, and MGCP. However, there are a few others as well. In this article, we will be discussing the different types of VoIP protocols and which one is right for you.


Session Initiation Protocol (SIP) is the most popular VoIP protocol. SIP is an IETF standard signaling protocol for initiating, managing and terminating multimedia sessions, such as voice and video calls over IP networks.

SIP trunking services use SIP to manage the call set up and termination process for VoIP calls. SIP establishes and tears down individual call sessions, but does not actually carry any media information. The media (voice or video) is transported using separate protocols such transit media protocols as the Real-time Transport Protocol (RTP).

H.323 is a family of international standards developed by ITU-T that define the components, protocols and procedures for multimedia communication over packet-based networks, such as IP networks. The H.323 standard includes specifications for audio, video and data communications over packet networks, including VoIP calls.

Media Gateway Control Protocol (MGCP) is a signaling protocol used by VOIP apps to control voice gateways. Gateways are devices that connect VoIP networks with the Public Switched Telephone Network (PSTN). A voice gateway allows VoIP devices to place and receive phone calls to and from regular phones on the PSTN network.

signaling protocols


H.323 is a family of standards that define various aspects of audiovisual communication over packet networks, including VoIP calls. H.323 was originally developed by the International Telecommunication Union (ITU) in 1996 to facilitate audio and video calls over IP networks, and has since been updated several times to include newer features and technologies.

H.323 is one of the most widely used VoIP protocols, particularly in enterprise environments, and is supported by a number of popular VoIP platforms including Avaya, Cisco, as well as many open source solutions.

While H.323 can be used for point-to-point calls, it is primarily designed for multi-point conferencing with features such as call forwarding, call waiting, and conference calling. H.323 also supports video conferencing and data sharing (using applications such as whiteboards and shared document viewers).

H.323 uses a variety of codecs for audio and video encoding/decoding, including G.711 (PCM), G.722, G.728, GSM-FR, and H.261/H.263 for video.


Media Gateway Control Protocol (MGCP) was one of the first VoIP protocols. It was developed with the intention of making it easy for traditional TDM PBX systems to be connected to IP networks. MGCP is still in use today, but has largely been replaced by newer protocols such as SIP and H.323.

MGCP uses a centralized architecture in which all call control signaling is handled by a media gateway controller (MGC). The MGC is responsible for setting up, managing and tearing down VoIP calls. MGCP gateways are typically controlled by an MGC that is located on the same network.

One advantage of MGCP is that it can be used to connect legacy PBX systems to IP networks. This means that companies with existing TDM PBX systems can gradually migrate to VoIP without having to replace their entire system at once.

Another advantage of MGCP is that it can be used to connect multiple media gateway devices together into a single logical entity. This makes it possible for companies to have multiple call processing entities on different networks without having to manage each one separately.

The main disadvantage of MGCP is that its centralized architecture can be a bottleneck in large VoIP deployments. This is because all signaling traffic must pass through the MGC, which can become overloaded if there are too many calls being processed simultaneously.

Another disadvantage of MGCP is that it does not support many of the features that are now commonplace in VoIP systems, such as call forwarding and caller ID.

In summary, MGCP is a VoIP protocol that was developed for connecting legacy PBX systems to IP networks. It has since been replaced by newer protocols such as SIP and H.323, but continues to be used in some deployments due to its compatibility with existing systems


MEGACO (also known as H.248) is a VoIP protocol that was specifically designed for VoIP gateways. It’s used to control media streams and the signaling gateway functions. MEGACO is capable of supporting any type of media, including voice, video, and data.

MEGACO was designed to be independent of the underlying transport protocol, which means it can be used with both IP and non-IP networks. It’s also scalable, so it can be used in small VoIP systems or large enterprise systems.

One of the benefits of MEGACO is that it supports both symmetric and asymmetric VoIP calls. Symmetric calls use the same amount of bandwidth in both directions, while asymmetric calls use more bandwidth in one direction than the other. This allows you to optimize your bandwidth usage depending on your needs.

MEGACO is a well-established VoIP protocol and it’s supported by a wide range of VoIP hardware and software products. However, it’s not as widely used as some other protocols, such as SIP or H.323.


The Skinny Call Control Protocol (SCCP) is a Cisco proprietary VoIP protocol. That means that it can only be used with Cisco hardware and software. SCCP was designed to work on slower internet connections, so it’s not the best choice if you have a fast connection.

The main advantage of SCCP is that it’s very stable and easy to use. It’s also very well-documented, so if you need help setting it up, you should be able to find what you need.

The main disadvantage of SCCP is that it’s not as flexible as some of the other protocols. For example, you can’t use it with any non-Cisco equipment, and you can only use it on slower internet connections.

Selecting the Right VoIP Protocol

There are a few different VoIP protocols to choose from, and it can be tricky to decide which one is right for you. The most popular VoIP protocols are SIP and H.323. SIP is the most commonly used protocol, and it is recommended for most users. H.323 is typically used by businesses that need more features than SIP offers.

Consider your VoIP System

When you’re ready to move your phone system to VoIP, you need to select a VoIP protocol. There are three major VoIP protocols in common use today — H.323, SIP and MGCP. Each has its own strengths and weaknesses, so it’s important to understand the differences before you make your decision.

H.323 is a complex standard that covers everything from call setup to video conferencing. Because of its complexity, H.323 systems can be expensive and difficult to manage. H.323 is most commonly used in large enterprise systems or in systems that need to interoperate with legacy TDM equipment.

SIP is a simpler protocol that was designed specifically for VoIP. SIP systems are easier to manage than H.323 and often less expensive. SIP is the most popular VoIP protocol in use today, and it’s the only protocol supported by most hosted VoIP providers.

MGCP is a legacy protocol that was designed for use with traditional TDM systems. MGCP can be used with VoIP, but it offers no real advantages over SIP and is not as widely supported. You’re likely to encounter MGCP only if you’re working with legacy equipment or if you have an unusually complex system.

Consider your IP Network

In order to make sure that your business is running as efficiently as possible, you need to choose the right VoIP protocol. But with all of the different options on the market, how can you tell which one is best for you?

The first step is to consider your IP network. If you have a private IP network (which is usually the case for most businesses), then you can choose from a number of protocols, including H.323, SIP, and MGCP.

If you have a public IP network (such as the Internet), then you’ll need to use a different protocol, such as SIP or IAX.

Once you’ve determined which protocol(s) will work with your IP network, the next step is to look at your current phone system. If you’re using an analog phone system, then you’ll need to use a VoIP gateway in order to connect to a VoIP server.

If you’re using a digital phone system (such as an PBX), then you’ll need to use a digital VoIP card in order to connect to a VoIP server.

Finally, you’ll need to decide on a VoIP server. There are two main types of servers: on-premises and hosted. On-premises servers are usually less expensive, but they require more technical expertise to set up and maintain. Hosted servers are more expensive, but they’re much easier to set up and maintain.

Once you’ve considered all of these factors, you should be able to narrow down your choices and select the best VoIP protocol for your business.

Consider your Telephony Service Provider

The type of VoIP protocol you use will be based on the services that your Telephony Service Provider (TSP) uses. TSPs can provide you with a service that uses either the Session Initiation Protocol (SIP) or one of the older protocols, such as H.323. SIP is the latest protocol and is slowly becoming the industry standard, so you may want to consider using this type of protocol if it’s available from your TSP. However, H.323 can still be used and may be a better option for you, depending on your specific needs.


When it comes to VoIP protocols, there’s no one-size-fits-all solution. The best VoIP protocol for your business will depend on your specific needs and requirements.

If you’re looking for a VoIP protocol that can provide you with the best possible call quality, then SIP is the way to go. However, if you need a VoIP protocol that’s more versatile and can be used with a variety of different devices and platforms, then consider using IAX.

No matter which VoIP protocol you choose, make sure that it’s compatible with your VoIP system and devices. This will ensure that you can get the most out of your VoIP system and experience the best possible call quality.