SIP Trunks

What are SIP Trunks?

In summary, SIP Trunking is a voice service that connects your telephone system to allow all calls to breakout onto the UK’s public telephone network. A stable broadband or secure Ethernet connection is required to connect the phone system to the Gamma network ensuring quality of service for all voice traffic.

Can I purchase SIP Trunks from Keytech Networks?

Keytech Networks provide SIP Trunks for customers seeking a more cost-effective telecoms solution compared to the legacy ISDN2/ISDN30 lines that have served the business until this point. It has been announced by Openreach that legacy ISDN services will be switched off in 2025 and many businesses with an IP-Enabled PBX are either moving to SIP or Hosted VoIP Telephony.

All our SIP Trunks are provided over the Gamma network for peace of mind for all of our business customers.

What are the benefits of SIP Trunks v ISDN lines?

Where do we start. ISDN lines have reached the end of their intended lifespan and have become expensive to run and maintain, hence why Openreach announced two years ago that 2025 will be the year in which all ISDN services will be phased out.


We have outlined some of the benefits below:


  • Cost Savings
  • Reduced Call Spend with a better commercial offering
  • Security
  • Flexibility for day to day business
  • Ability to scale without having to add new phone lines or ISDN bearers
  • Business Continuity
  • Number flexibility which is incredibly useful if your business is moving premises

What type of PBX (Phone System) are supported with Gamma SIP Trunks?

  • Avaya
  • Cisco
  • Ericsson LG-iPECS
  • Mitel
  • NEC
  • Samsung
  • Panasonic
  • Toshiba
  • Unify

Who will support my phone system?

This is not a service we provide here at Keytech Networks, we recommend speaking with the installer of your phone system to continue a maintenance agreement for future support of the system.

All SIP Trunks provided by us will of course be managed by us and should any faults occur at any time, please report the issue by contacting us on 01403 620600, then selecting Option 1.

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