SIP and VoIP

High quality voice over IP services for the Digital world

With the Analogue turn off fast approaching in 2025 standard voice lines will soon be a thing of the past.

All voice traffic will be carried via SIP trunks using VoIP technology.

SWIC has partnered with Zapappi one of the UK’s most innovative SIP platform providers to deliver our voice capabilities.

SIP trunks are available for both business and home working scenarios.

SIP 2 Home

  • Includes basic SIP Trunk
  • 1 standard UK Telephone number
  • Inclusive calls Package
  • 2500 UK Local and National Minutes
  • 1000 UK Mobile minutes
  • £15 pmth

SIP 4 Business

  • Business SIP Trunk
  • 1 Standard UK telephone number other available at extra cost
  • Elastic Voice channels, use as many concurrent calls as you need

  • from £20 pmth

Our SIP business Trunks can also be used to support Microsoft Teams Direct Routing

If your organisation is working remotely and is a strong user of Microsoft Teams, but requires a more cost effective and flexible alternative to Microsofts calling plans, then Direct Routing could be the solution for you. 

Through Direct Routing, Microsoft Teams is routed to the traditional phone network (PSTN) allowing users to make both local and international calls (to and from non-Team users) without needing a hosted telephony system or PBX.

This method allows your employees to have a simple and convenient platform for unified (internal/external) communications. SWIC can implement a scalable, verified and cheaper system that can make calls to landlines and mobiles with essential added features: call transfers, queues, auto attendant, simultaneous ringing and many more. 

Stop juggling multiple systems for your file sharing, PBX and messaging; be more efficient and ultimately be more effective.

Less than 10 Teams Users

  • Starter Package for Teams Direct Routing includes 2 concurrent voice channels and standard UK Telephone number.
  • Min 12 months agreement
  • from £49 pmth

Between 11 and 50 Teams Users

  • Support for up to 50 users With 5 voice channels and 5 standard UK telephone numbers either Geo or NonGeo
  • Min 12 months agreement
  • from £199 pmth

More than 50 users

  • Greater than 50 users we will review your current usage and recommend a solution.
  • Starts from £299 pmth

Get a quote…


We specialise in complex connectivity services where other providers can’t or won’t deliver.

SWIC is a trading styles of Skyline Wireless Ltd Company Registration Number 11540717. Head Office: Unit 5 Spring Rise, Falconer Road, Haverhill, Suffolk, CB9 7XU