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Hosted Telephony

Cloud-based hosted telephony solutions are becoming increasingly popular for businesses across the globe. Using Voice over Internet Protocol (VoIP) technology, businesses can run their telephony systems over the internet which not only saves them money on call charges but also helps to improve business efficiency.

See below for more information on our hosted telephony solutions available for resellers.


Horizon is a complete communications service for business that provide an extensive range of fixed and mobile telephony capabilities via an easy-to-use web portal.

The service has lots of clever features and an emphasis on control and administration through the web which takes the burden away from your IT team.

With minimal capital outlay required, Zest4 Horizon is a reliable and proven service with a jargon free approach to telephony and communications. Horizon is a suitable solution for any sized business looking to improve their productivity and image.


  • Hunt Groups
  • Call Transfer
  • Click to dial
  • Busy Lamp Keys
  • Call Recording
  • Call Waiting
  • Music on hold
  • Auto Attendant
  • CLI Flexibility
  • Homeworker
  • One Number anywhere
  • Hot Desking
  • Mobile Twinning


  • Features that you can easily control
  • Empower your staff with Œone number anywhere¹
  • An on-demand service with no hidden costs
  • Lower Call Costs
  • Enables Flexible Working
  • Number Choice
  • Business continuity and disaster recovery solution

SIP Trunks Factsheet

Additional professional voice recordings for music and information on hold services are also available on Horizon. Click here for more information

Horizon Call Rates available here

SIP Trunking

SIP trunking is a Voice over Internet Protocol (VoIP) and streaming media service.

It is based on the Session Initiation Protocol (SIP)[1] by which Zest4 deliver telephone services and unified communications to customers equipped with SIP-based private branch exchange (IP-PBX).

Unlike in traditional telephony, where bundles of physical wires were once delivered from the service provider to a business, a SIP trunk allows a company to replace these traditional fixed PSTN lines with PSTN connectivity via a SIP trunking service provider on the Internet.

SIP trunks can offer significant cost-savings for enterprises, eliminating the need for local PSTN gateways, costly ISDN BRIs (Basic Rate Interfaces) or PRIs (Primary Rate Interfaces).


  • Geo Number Flexibility – Present alternate CLI’s – gives access to geographic number ranges outside of a business’ normal area thereby giving a local feel.
  • Business Continuity – a range of DR options
  • Automatic failover
  • 01,02,03 calls are free of charge
  • Scalable on a per-channel basis