Engineering-led business telecoms
Business communications, engineered properly.
Maincoms designs, installs and supports voice, mobile and data services for organisations across Portsmouth and Hampshire. Every system is specified by an engineer, tested before handover and supported by the team that built it.
✓ Gamma Gold Partner ✓ Yeastar Top Reseller 2023 ✓ Engineers based in Cosham
Line monitoring active
Faults flagged before they affect users
Engineer support
Monday to Friday, 09:00 to 17:15
Network and technology partners
Services
Voice, mobile and data under one support agreement
We supply and maintain the full communications stack, so there is one point of contact when something needs attention.
Business phone systems
Hosted PBX on Gamma Horizon or Yeastar P-Series Cloud Edition, or a Yeastar system on site, with Yealink handsets and softphone apps.
Mobile, SIMs and eSIMs
Handsets, SIM-only and eSIM connections on EE, Vodafone, O2 and Three, with usage controls and alerts.
Business internet
SoGEA, full fibre (FTTP), leased lines and 5G, with managed routers and optional 4G or 5G failover.
Software and integrations
Call recording, IVR, CRM integration and disaster recovery, configured around your call flows.
Our process
A structured approach to every installation
The same four stages apply whether we are connecting a single office or migrating several sites.
Survey
Site, network and existing services assessed
Design
Call flows, numbering and hardware specified
Install
Staged, tested and documented before go-live
Support
Monitoring and direct access to our engineers
Engineer’s note
Why we survey first
Most voice quality problems trace back to the local network rather than the phone system. Before installation we check bandwidth, QoS, VLAN configuration and Power over Ethernet capacity, so the system performs as expected from day one.
2027 switch-off
The PSTN and ISDN networks close on 31 January 2027
Openreach is withdrawing copper-based PSTN and ISDN services. Any equipment that relies on them, including phone lines, alarm diallers, payment terminals and lift lines, must move to a digital service before that date. We audit every circuit and device on site and plan the migration in stages.
Time remaining
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Top 6%
of Gamma partners (Gold Partner)
No.1
UK Yeastar reseller, 2023
Finalist
Comms Business Awards 2023
09:00 to 17:15
engineer support, Monday to Friday
After installation
Monitoring, resilience and cost control
Installation is the start of the service, not the end of it.
Proactive monitoring
Lines and devices are monitored, so faults are identified and investigated early, often before users are affected.
Disaster recovery
Documented failover plans divert calls to mobiles or alternative sites if a location loses power or connectivity.
Usage and cost control
Online Account Management provides spend limits, usage reporting and alerts across mobile and fixed services.
People
Direct access to the people who know your system
Calls are answered by our own staff in Cosham. You deal with consultants and engineers who are familiar with your installation.
Lance
Telecoms Consultant
Lance assesses requirements, specifies solutions and remains the point of contact for technical decisions throughout the project.
Sarah
Project Co-ordinator
Sarah schedules surveys and installations, co-ordinates with networks and suppliers, and keeps you informed at each stage.
Customer feedback
What our customers say
Read what our customers say about us on Google.
Contact
Speak to an engineer
Tell us about your site and what you need. One of our engineers will review the details and reply, usually within one working day.
Unit 5, Acorn Business Park, 5 Northarbour Road, Cosham, Portsmouth PO6 3TH
Monday to Friday, 09:00 to 17:15