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What is SIP trunking?

Session Initiation Protocol (SIP) trunking enables communications using an internet connection, instead of a traditional phone line.

  • SIP rentals cost less than traditional ISDN lines
  • Easily scalable to the size of your business across multiple sites
  • Offers increased reliability when compared to traditional ISDN lines
  • Feature rich communication
  • Flexible – increase or decrease the number of channels based on demand, without needing to install physical lines

SIP Trunking uses VoIP (Voice over Internet Protocol) to connect a private branch exchange (PBX) or hosted telephony system to the internet. Via SIP trunks, a business is directly connected to the internet using a standard internet connection or private circuit for high performance voice communications.

SIP Trunks themselves enable voice traffic to be carried over a data connection. They allow a direct connection to the internet and enable VoIP to function beyond a company’s own firewall without the need for an IP-PSTN gateway. This allows greater flexibility in how and where phone numbers with geographic indicators can be used, as well as offering free calls between sites and savings on line rentals costs.

The number of lines a business utilises can be easily increased or decreased, based on usage. This incredible level of control makes it an appealing choice for businesses that have seasonal peaks in calls or are rapidly expanding.

Please note:

It is important to note that BT has stated they will switch off the old ISDN (Integrated Services Digital Network) network by 2025, meaning all businesses will need to upgrade to use SIP to deliver their calls over an IP network.