SIP Trunking

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What is SIP Trunking?

SIP Trunking or Trunks enable business phone solutions to send and receive calls via an IP broadband network. SIP stands for Session Initiation Protocol, an application layer protocol, and defines the means by which telephone systems communicate to the phone network. It is an application protocol which enables voice, video and messaging over an internet connection for office phone systems.

SIP trunking has emerged as the means by which PBX office phone systems communicate, and the alternative of choice as traditional ISDN circuits are phased out through 2025. Unlike ISDN, the lines provided are not physical, rather a service provided over the business internet connection. A fundamental requirement is that they require good quality bandwidth, low latency, low packet loss and upload and download speeds over the business internet connection.

Consider SIP trunks as ISDN channel replacement

SIP Trunking can deliver immediate and substantial cost savings, at the same time providing much greater flexibility and resilency for business phone solutions.

Juno uses SIP Trunks as its recommended replacement for ISDN, as they provide a more flexible and a lower cost alternative to ISDN for inbound and outbound voice calls, when connecting your office phone systems to the PSTN. With ISDN soon to be switched off, businesses are now turning to SIP for their PSTN connectivity for their on-premises or hybrid PBX.

If your business operates across multiple sites, it is likely that you have existing ISDN connections to an individual PBX office telephone system at each site. With SIP this becomes much easier to rationalise, with the number of connections you need being reduced, along with reducing associated maintenance costs. Costs are minimised to just the quality IP broadband connection, SIP trunks and handset or endpoint costs at each site.

Benefits of SIP Trunking?

SIP Trunking is normally more cost effective as its purchased on a per channel basis. Set-up costs are normally lower than ISDN charges. It is more flexible in terms of the telephone numbers you can have and where you can have them. It is quicker to install and it can offer a robust business continuity solution alternatives.

SIP trunk configurations are extremely versatile and they are worth considering for businesses who are moving premises and want to keep their existing numbering structure. Existing numbers can be ported in and additional geographic numbers added easily. SIP trunking allows for the easy manipulation and presentation of outbound numbers. If you have an office in Nottingham but need your calls to go out on a York based number, then this is possible. Likewise on inbound calls, callers might call the Leeds office number, but calls can be routed such that they are answered by staff in the Derby office.

Juno’s SIP Trunk solutions are ISO27001-approved. They come with in-built fraud mitigation and disaster recovery services. They deliver voice, data and business critical applications with 24/7 fault management. It’s compatible with all our UC (Unified Communications) solutions, as well as Microsoft Teams.

SIP Trunks connect your PBX (Private Branch Exchange) to the PSTN (Public Switched Telephone Network) over broadband or Ethernet connections. SIP Trunks work seamlessly with most of the leading IP PBX systems available in the UK.

Unified Communications systems depend on underlying SIP trunking, which in turn supports a full UC strategy across multiple locations and ensures different devices can be integrated on to the network. Quality of Service (QoS) is provided, prioritising calls over your data traffic, to make sure your calls will always get to their destination and are crystal clear.

SIP Trunking is less costly per channel than ISDN and it’s easily scalable and provides multiple robust options for business continuity and disaster recovery.

SIP Trunk Numbering

    • Port existing telephone numbers to Juno’s SIP network solution
    • No need for diversion charges when moving office
    • Numbers available from all UK dialling codes, regardless of your geographic location.
    • SIP can provide numbers for International locations.

High Volume SIP Trunks

High Volume SIP Trunking is designed specifically for customers, and more specifically high volume outbound call centres which require high call attempts per second and high channel capacity. They run on separate dedicated platforms built for high traffic volumes, ideal to support busy call centres. Combining the certainty of a committed channel volume but with the flexibility to burst with spare capacity on the network.

Resiliency & Flexibility with SIP Trunking

    • Highly scalable, quickly easily increase/decrease the number of SIP channels as required
    • Combine with ISDN for resilient hybrid solutions
    • Divert calls to a preplanned backup destinations  in case of internet or power failures
    • Multiple resilient configurations available for business continuity

In summary, most telecoms company should recommend SIP trunking as the preferred vehicle for small office phone systems to communicate with the public switched network. Download a copy of our e-guide here, outlining the business case for SIP. Call Juno for advise and guidance on the features and benefits of our world leading SIP Trunking solutions.



Is SIP trunking expensive?

The good news is if you’re considering a switch from ISDN, SIP is usually cheaper as you could save up to 50% on line rentals and 25% or more on call costs.

Do SIP trunks provide good voice call quality for my office phone system?

Providing you have the right data services in place, call quality will be clear as a bell.

Does SIP trunking support business continuity?

SIP trunking delivers robust business continuity options, as well as diverse routing features.

Is SIP trunking flexible enough to support a businesses growth?

SIP trunking can support growth easily, allowing the addition of new lines and locations without disruption or large big capital outlays.

How much does SIP cost from Juno?

This will depend on numerous factors, i.e number of channels, locations, numbering plans, resiliency options etc. Juno experts can advise on the right configuration for your business.

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