Session Initiation Protocol, or SIP, involves using voice over IP to connect a private branch exchange (PBX) to the Internet. SIP trunking works by replacing the conventional telephone trunk, which allows the enterprise to communicate with telephone subscribers around the world.

With SIP trunking, a business can:

  • Browse the Internet
  • Use texting and email
  • Use an analog phone system, digital phone system, or mobile phone
  • Make emergency calls
  • Make and receive local and long distance calls

SIP trunking combines video, voice, and data into a single line which eliminates the need to have separate media for each mode. This enhances the reliability of the system and reduces overall costs for the business.

PSTN Gateways

When a business employs SIP trunking, it may also need one or more public switched telephone network gateways. PSTN gateways are hardware components that translate media and signals between the PSTN and the Enterprise Voice infrastructure. If an enterprise has more than one site, one or more gateways for each site is usually required. Determining the size, location, and number of PSTN gateways needed is one of the most important decisions a business will make when planning an enterprise voice infrastructure with SIP trunking.

With the right PSTN gateways, SIP trunking can be a lucrative choice for businesses. Additionally, it can also help businesses reduce costs and increase the effectiveness and reliability of their communication systems.