M365 has become a de-facto standard of many functioning organisations and by utilising the Phone System element of Microsoft Teams you can replace your out-dated or expensive phone system with a fully integrated PBX within the Teams software.
If Teams isn't your thing then we have several turn-key solutions which should suit at an equal alternative. Fully independant cloud unified communications which will 'plug in' to your existing business workflow and run on any device.
If you have a speciality case we can install, manage or remediate your on-premises telephone system as a standlone communications system often with tools cloud systems can't provide - such as IP DECT.
Should 'one size' doesn't 'fit all' we can use smart architecture to mesh your multiple systems together to make them interoperable even when there doesn't seem any way of making it so.