BT’s decision to retire ISDN by 2025 will have taken no-one by surprise. As companies look to future-proof their operations by embracing VoIP communications technology, there has been a shift away from ISDN in the last decade. Channels have shrunk from 4.7 million in 2007 to fewer than 3 million today.

With only nine years until switch-off, it is important that businesses make informed decisions as they put migration plans to a VoIP solution in place, especially if they aim to gain a competitive advantage from moving to SIP.

Below we answer some frequently asked questions to help ensure you’re up to speed when it comes to making the move.

What is ISDN?

ISDN relies on the PSTN to carry voice, data and other services. Once this system becomes obsolete, many businesses will transfer to SIP Trunking (Session Initiation Protocol).

What is SIP Trunking?

SIP Trunking enables communication elements such as video, voice, chat and data. It’s a great replacement for ISDN, and is compatible with most brands of phone systems (check your PBX).

What are the main functionality benefits of SIP Trunking?

  • Scalability: SIP’s main advantage over ISDN is how immediately scalable it is. New trunks can be added immediately as you grow, or doing seasonal periods.
  • Resilience and cost-efficiency: SIP also provides disaster recovery solutions. If your primary business premises suffers a power outage, for example, calls can be diverted almost instantly, something which could take days to achieve with ISDN. SIP also allows facilitates non-geographic dialling codes, enabling businesses outside of London, for example, to have a virtual presence within the capital. SIP lease is significantly less expensive than ISDN line rental, with the benefits of free internet calls, call-forwarding and free inter-site calling as a bonus.
  • Flexibility: SIP enables a versatile, flexible internal communications network. Flexibility is a key 21st-century workplace mantra, and remote working is increasingly recognised as bringing both economic and creative benefits. SIP telephony enables staff to be contacted through one office contact number, no matter where they are working and what device they are using., It ensures optimum connectivity and cost-efficiency, on a single tariff.

As more companies discover the benefits of migration to SIP systems, it is important to make sure you’re informed to remain competitive. Download our ISDN to SIP white paper for more information or speak to a member of our team to find out what bespoke solution best fits your business objectives and strategy.

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