Focus Group
Focus Group 0330 024 2000

SIP trunking is the fastest-growing telephony technology. It is a highly-flexible alternative to ISDN and is compatible with all the leading IP PBX brands.


Compared to ISDN, SIP Trunks are cheaper on a per-channel basis and more flexible in terms of what telephone numbers you can have and the locations in which you can have them.

In addition, they are quicker to install and offer a robust business continuity service that ensures your business never loses any calls.

Our service can support connections ranging from two channels for businesses with small PBXs, with no limit on the number of channels that can be supported for large enterprises and contact centres.


Download our SIP Trunks brochure

  • Save Money:
    IP Connectivity costs less than ISDN with lower call costs
  • Flexibility:
    SIP trunking enables you to move office and keep your number
  • Resilience:
    SIP provides business-grade resilience for disaster recovery
  • Continuity:
    Temporary office relocations can be achieved cost-effectively
  • Rationalisation:
    Multi-site SIP can reduce the equipment needed across sites
6 Months Free SIP Rental. Convert your lines from ISDN to SIP and get 6 months free line rental.

International SIP Trunks


Focus can now offer SIP Trunks across a number of countries around the world, with new countries being rolled out every quarter. The map below shows countries currently covered, or on the road map to be covered by the end of Q3 2015.

SIP Trunks

why join focus?

  • Award Winning Telecoms
  • UK Based Service Team
  • 24/7 Support
  • Excellent Pricing & Portfolio

Focus Group

For more information about our Voice Services please call

0330 024 2003

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