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Difference between SIP and IAX

Difference between SIP and IAX

SIP and IAX are both VoIP protocols used for communication over the internet. They offer many of the same features, but there are some key differences between them. In this article, we’ll take a look at those differences and explain why you might choose one protocol over the other.

What is SIP?

SIP is short for SIPPING, which stands for Session Initiation Protocol. SIP is a communication protocol that is used to set up and manage real-time communication sessions. It can be used for voice, video, and text communication. SIP is a peer-to-peer protocol, which means that each SIP endpoint (client or server) can initiate, terminate, or modify a session.

SIP sessions can be point-to-point (two devices communicating with each other) or multipoint (three or more devices communicating with each other). SIP is typically used in VoIP (Voice over IP) applications, but it can also be used for other types of real-time communication, such as video conferencing or Instant Messaging.

What is IAX?

  • IAX, or Inter-Asterisk eXchange, is a VoIP protocol that was developed by Digium specifically for use with the Asterisk private branch exchange system. IAX uses a single UDP port for both control and media traffic, which simplifies firewall configuration and reduces latency.
  • IAX also offers compression and encryption options, making it an ideal choice for secure VoIP communications. In addition, IAX supports trunking, which allows multiple calls to be multiplexed over a single connection.
  • This can save on bandwidth costs, particularly for long-distance or international calls. IAX is a versatile and efficient VoIP protocol that is well-suited for a variety of Asterisk-based applications.

Difference between SIP and IAX

SIP (Session Initiation Protocol) and IAX (Inter-Asterisk eXchange) are both protocols used for VoIP (Voice over IP). SIP is a signaling protocol that is used to establish, maintain, and terminate VoIP calls. IAX is a proprietary protocol that is used to transport VoIP data. SIP is designed to work with any type of VoIP system, whereas IAX is designed specifically for Asterisk-based systems. SIP is more widely implemented than IAX, and it offers better call quality and reliability. However, IAX has some advantages over SIP, such as lower latency and less bandwidth consumption.


SIP trunking is growing in popularity for businesses, as it offers a number of advantages over traditional phone lines. However, some companies are still unsure about whether to choose SIP or IAX. In this article, we’ve outlined the key differences between these two protocols so that you can make an informed decision about which one is right for your company. We hope this information has been helpful and wish you all the best in choosing the right communication solution for your business needs.

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