TSI have been independent providers of fixed telephone lines, including Analogue (PSTN), ISDN2e and ISDN30, for many years, as well as modern SIP Trunks.

TSI have our own in-house provisioning, support and billing platform.  We can easily transfer existing services or install new telephone lines at your business premises. TSI remain as your single point of contact throughout the process and for all of your telecom needs with personalised service that you can trust.

CallSwitch

SIP Trunks

A modern alternative to fixed lines by connecting your business premises to the PSTN via IP using your broadband.

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Fixed Lines

Traditional Analogue PSTN lines, ISDN2e and ISDN30 circuits

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