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SIP Trunks

A more flexible and lower cost alternative to ISDN for inbound and outbound voice calls.

Future proof your communications

Gamma Platinum Partner

SIP trunking is the IP based replacement for traditional ISDN circuits which BT has announced are being withdrawn by 2025. It connects your PBX or telephone system to the PSTN via broadband, ethernet or private circuit into the national network.

Compared to ISDN our SIP trunking service is less costly per channel and more flexible in how and where geographic telephone numbers can be used. It’s also quicker to install and provision and, as standard, it delivers extremely robust business continuity.

The Alternative to ISDN

  • Lower cost than ISDN (up to 3 times lower)
  • Speedy installation in less than 48 hours (on existing data bearers)
  • Keep your business telephone numbers, no matter where you relocate
  • Increase or reduce the number of SIP trunks without extensive lead times
  • Automatic Fail over and Disaster Recovery options

The Alternative to ISDN

  • Lower cost than ISDN (up to 3 times lower)
  • Speedy installation in less than 48 hours (on existing data bearers)
  • Keep your business telephone numbers, no matter where you relocate
  • Increase or reduce the number of SIP trunks without extensive lead times
  • Automatic Fail over and Disaster Recovery options

Flexibility and Resilience

SIP trunking is the latest form of technology that delivers telephone lines using an external data connection as the bearer for the purpose of making and receiving calls. This virtual IP based service uses network data connectivity instead of dedicated fixed line technology methods.

Similar to ISDN, SIP trunks offer multiple flexible lines, unlimited direct dial ranges and caller display. However, SIP trunking provides the ability to converge your voice calls and data onto a single data connection enabling cloud and site based resilience.

Return on Investment

SIP trunk technology can reduce the need for dedicated connections as one single data connection can be used to carry both your voice and data traffic.

Ongoing telephone system hardware and support costs can be significantly reduced as SIP trunks are software licence based, eliminating the requirement to invest and pay support charges for expensive ISDN hardware line cards.

Why partner with Opus for SIP?

  • We are a Gamma Platinum Partner for SIP Trunking.
  • Gamma are the UK’s leading provider of SIP.
  • We offer international SIP solutions from other trusted providers.
  • We understand and match the right solution to your business needs.
  • We provide the most resilient solution for your business.
  • We also seamlessly manage the entire process, so you can take advantage of all the benefits whilst suffering minimal disruption.

Follow the links below for more information or call us on 0800 316 7566 for help and advice.