Available in: Jersey

JT’s SIP (Session Initiated Protocol) service is replacing our legacy ISDN 2 and ISDN 30 products. JT SIP connects your PBX directly and securely to the JT public telephone network via a private IP connection to carry your inbound and outbound voice calls. 

JT SIP provides a highly-flexible alternative to ISDN. Compared to traditional ISDN services JT SIP Trunks are more flexible in terms of the number of voice channels you can have. 

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. 

JT SIP connects your PBX to JT’s IP Core, enabling full PSTN breakout on the public telephone network utilising our full fibre network. The connection from your site (or sites) to our network is via a dedicated and secure IP connection and is delivered as an end-to-end service with voice channel guarantees. 

Unlike ISDN, SIP trunks are a highly cost-effective system that can be scaled up and down according to the requirement, enabling more effective use of IT team resources by making the provisioning of new users with voice and data systems quick and easy.


Utilise JT’s SIP service with the following business benefits:

  • Includes a fully integrated DDI solution
  • Benefit from JT’s competitive fixed line tariffs
  • Scalable and flexible, easily add and remove voice channels as required
  • Secure and reliable connection to JT’s voice network
  • Feature-rich voice service

If you are interested in learning more about JT SIP please contact our Business Solutions Team on 882345, and they will be pleased to discuss the service with you.


To learn more about this product and the benefits it has for your business, click the links below:

Call charges for JT ISDN, SIP and Cloud PBX Services

Call Charges for JT ISDN, SIP and Cloud PBX Service
Unless stated otherwise, charges shown are the per minute rate from a JT ISDN, SIP or Cloud PBX service, all calls are charged in increments of 1 minute, with a minimum charge of 7p
Call Charges
Destination Daytime Evening Weekend
Local landline (01534) 0.23p 0.23p 0.23p
Local mobile 12p 10p 9p
Guernsey landline (01481) 3.5p 3.5p 3.5p
Guernsey mobile 20p 15p 13.5p
UK Fixed Line 4.5p 4.5p 4.5p
UK mobile 26p 16p 14p
Speaking Clock 20p 20p 20p

Usage charges for calls, texts and data exclude GST which is added at the time of billing

National & International Charge Periods Daytime, evening & Weekend
Daytime (D) Mon to Fri, 8am – 6pm
Evening (E) Mon to Fri, after 6pm & before 8am
Weekend (W) All day Saturday & Sunday
Call charges for non-geographic services vary.

SIP Price Increase

On the 24th March 2022 customers migrated from ISDN2 to JT SIP will see their channel and support prices increase as per the table below. Should you require any further information on our JT SIP pricing please contact us here.

Price Per Channel £16.00
Connection Fee £300 flat fee
Change/Shift/Add £75 flat fee
Ultimate Care Plus £3.50
Ultimate Care £3.00
Superior Care Plus £2.50
Superior Care £2.00