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Are you still using ISDN in your business?

Switching to SIP

With many businesses allowing their employees to work from home indefinitely, reliable communications are a must. We all know how frustrating it can be trying to get hold of a supplier, only to find out their telephone network is down. So, if your clients and customers are having a similar experience when trying to speak to your employees, switching to SIP from ISDN could be the answer to your reliability prayers.

What is SIP Trunking?

SIP is one of the possible protocols you can use for VOIP communications. It provides a way to convert voice signals into data that devices used by a caller can decode.

Standing for Session Initiation Protocol, SIP is a way to make and end connections for data and voice transfers over the internet.

The virtual version of an analogue phone line, SIP, can connect to one or twenty channels. This allows you to make local, long-distance, and international calls over the internet.

What are the benefits of moving from ISDN to SIP?

Cost savings

Whilst it differs per company, one of the great benefits of SIP is the cost savings that are made. From line rental to calls, SIP is the cheaper but better option to ISDN.

Additional savings can be made on things such as the physical infrastructure. With fewer lines needed, the cost of the maintenance also falls.

Unified communications

SIP can act as a gateway towards unified communications as a service (UCaas). Working with a provider that offers a full suite of collaboration tools, you can unlock a host of communication apps and other cloud-based tools that promote productivity across your business.

Outstanding reliability

For those who have experienced the lengthy downtime associated with ISDN, you will know that it can be for days rather than a few hours. That’s where SIP comes into its own. The modern solution will have built-in resilience features, so you could maintain business continuity if the worst was to happen. Instant re-direction of calls means your clients and customers can still contact you.


Despite the rumours about the security of introducing SIP into your business, if the trunks are implemented correctly, then cybersecurity should not be an issue. If anything, your connectivity should be more secure than it was previously. An appropriately configured SIP will give you the means to handle your connectivity via your firewalls or a router with firewalls built in.

Fully Hosted

The other option to consider is to ditch the PBX phone system altogether and to go fully hosted. This means running your communications over an internet connection without the need for the hardware which, SIP trunks still rely on. This can save you money on maintenance as there is no hardware to look after and gives you further flexibility such as taking handsets home to work from home. Using softphones instead of handsets or simply moving from one location to another. It all becomes more flexible, reliable, and productive.

How can I change to SIP?

Here at LMS Group, we can work with you to upgrade your ISDN line to SIP. With our team of experts on hand to help you select the right option for your business, fill out the form below to request a call back.