Aberdeen-based SaaS provider SureVoIP has integrated Signalling System No.7 (SS7) telephony following an 18-month preparation period and a six figure investment in the project.
The company claims that the completed project is a first in Scotland and puts the business on a level playing field with much larger rivals in the market.
SS7 is a set of Ofcom regulated signalling protocols that physically connects to BT's own network, rather than over the Internet.
SureVoIP currently employs seven staff but plans to adda further three by early 2018.
MD Gavin Henry said: "While it's quite common amongst the industry's big players, our adoption of SS7 technology gives SureVoIP a competitive advantage compared to other ITSPs in the UK, and clearly demonstrates our commitment to providing the highest level of service and technical capability.
"This development is the culmination of many months hard work by our team and underlines our credibility as a serious player in Scotland's telecoms market."
Established in 2011 SureVoIP is now a carrier-grade VoIP provider that delivers service over its own wholly owned and managed systems.
Last year the company won ITSPA's Best Business ITSP (medium enterprise) gong and has also been awarded ITSPA's Quality Mark.