SME SIP Trunks

For enterprises wanting to make full use of their installed IP Office and not only communicate over IP within the enterprise, but also outside the enterprise, a SIP trunk provided by Telefonix Voice & Data to connect to the traditional PSTN network is the solution.

Unlike in traditional telephony, where bundles of physical wires were once delivered from the service provider to a business, a SIP trunk allows you to replace these traditional fixed PSTN lines with PSTN connectivity via a SIP trunking service provider on the Internet.

SIP trunks offer significant cost-savings for enterprises, eliminating the need for local PSTN gateways, costly ISDN BRIs (Basic Rate Interfaces) or PRIs (Primary Rate Interfaces). In other words, SIP trunks do away with the need to buy ISDN30 or ISDN2.

Best of all, Telefonix Voice & Data SIP trunks also come with 5000 FREE bundled 01,02 and 03 minutes AND 2000 Mobile Minutes per channel on all major mobile networks! (conditions apply).

SIP Replacing ISDN30

In May 2015 BT stated that it intended to migrate all customers onto the IP network by 2025, switching off PSTN and ISDN.

This means that your network is likely to force you to move at some time in the future so there is no better time to investigate the Telefonix SIP offerings and contact us on 01252 333888!

Whilst 2025 may seem like a long time away, this process will take a long time and start relatively soon in order to end of life the ISDN by 2025.

Contact Telefonix Voice & Data
ISDN to SIP guide
  • Make large savings on your line rental and call costs
  • Reduce the number of ISDN lines but with minimal upfront capital expenditure
  • Increase your call capacity to connect multisite locations and remote workers
  • Avoid complicated discount structures or long-term lock-ins
  • Make free calls between your branches and offices
  • Boost resilience for reliable, high-quality connectivity
  • Ensure business continuity and disaster recovery
  • Enable flexible working while controlling costs
  • Expand call capacity with same-day effect
  • Add new geographic numbers for any UK or ROI area code