No strings attached.

Not sure if hosted telephony will work for you? 

Try it before you buy it with our no strings attached, 14-day free trial.


  • Try up to 5 licenses to see how you and your team use it.
  • Use the app or access it through Voice Over IP.
  • Have a standard handset on your desk.*


Our dedicated team will have you up and running in no time. If you decide you don’t like it, no worries, no hard feelings.

SIP (Session Initiation Protocol)

Flexible telephony that works wherever you
choose to locate your office.

Session Initiation Protocol (SIP)

SIP trunks have replaced ISDN and analogue lines for voice calls as B.T. is withdrawing these services. With SIP, your calls are made over your internet connection (or one provided specifically for the purpose) and by connecting your phone system to the cloud you will have more flexibility and the ability to have ‘automated failover’ for your system.

SIP is used to initiate and manage interactive communication sessions. Voice, video, chat, and instant messaging are just a few of the applications that may be facilitated . Many new applications are being developed that require SIP for VoIP, and instant messaging in next generation networks such as 4G & 5G.


Session Initiation Protocol (SIP) is a signalling protocol used for initiating, maintaining, and terminating real-time communication sessions. SIP is widely used in VoIP communications and other types of multimedia sessions. SIP can be used to set up and control multimedia call sessions such as video conferencing and VoIP.


SIP is a standards-based protocol, which means it is well-documented and has been extensively evaluated. This makes it more dependable than proprietary protocols. It’s designed to be simple and efficient. It uses a small number of message types and headers, which makes it easier to implement and debug.


SIP is flexible and can be used for a wide variety of applications. It is often used in VoIP systems, but it can also be used for video conferencing, instant messaging, and other types of multimedia communications. It’s also extensible and can be easily extended to support new features and applications.

Take your business mobile.

Any device, anywhere, anytime!

Remote working done right.

27/7 Access with an internet connection.

Telecoms Expertise

Experience is everything & we've got it in spades. Best tech, best people. Sorted.

Dedicated Support

From your account manager to the onsite technician our support is second to none.

Get In Touch Today

The evolution of the working environment heralds a sea change in telecoms.

What Clients Say About Us

Joanne Bloomfield, CEO JDE Marketing

"My telecom system was a daily pain! It never worked the way I needed it to, and cost more than I was comfortable with. Then I was introduced to Sloane Curtis Solutions. Fantastic service, the right tech for my company and a much better price than I was paying. I’m now a happy camper. Highly recommend.”

Craig Rosenthal, CEO Medical Equipment Supplier

“We needed to plan for the end of ISDN services, but we didn’t know where to start. The Sloane team not only helped us develop a roadmap to phase out our old system, but they also helped with creating for the future, identifying the right kit and training our whole team so the switch over was seamless.”

Janet Simmons, MD Mobility Solutions

“When we returned to being fully office based after lockdown, a large percentage of our team wanted to continue working from home. Sloane Curtis Solutions leaned into the task of finding the right solution for our new normal of working both at home and in the office. Superb service at every stage – highly recommend.”

Robert Yelland, IT Director PPE Provider

“When it came time to upgrade our system Gary and his team helped us figure out what we needed. We had always had an office-based telephony system, but it was clear that moving to a hosted solution was the way forward for us. HUGE saving and no hassle to switch over.”

Jean Hartzel, MD Utilities Management

“We had four different numbers in play for our UK offices and it was causing confusion with both our customers and within our internal operations. Sloane reviewed our set-up, built out a plan to unify our calls with a non-geographic number and create a more professional front of office via the use of an App for our remote workers and sales team. Great company to work with.”