Telephone services

IT Services provides the central telephone services for Trinity. Towards the end of this page you will find links to instructions on how to use the internal phones as well as forms for submitting requests for new phone extensions, mobile phones, phone extension moves and more. As the majority of these service incur a cost to the requesting area, please make sure that all work and expenditure has been authorised by your Head of Area before submitting any request.

Who can use this service


Getting started

You can use the relevant links below to setup your voicemail on your internal phone extension and become familiar with the Trinity telephone service instructions, such as dialling an external number from an internal phone line, calling a Trinity extension from a Trinity mobile, or how to place a call on hold or transfer a call.

Access levels to
external phone numbers

Different phone lines will have varying access to call external phone numbers and/or mobile phone numbers.
Purchase Orders Please note that some requests will require a Purchase Order. Purchase Orders should be raised in iProc. Please search the Main Store for ITSTEL and you will be presented with the Telephone Services Catalouge.

Reporting extension

If your phone displays an error message (see sample message below), press the top left function button, enter the extension number and press the down arrow button. The phone will then re-register and service will resume.

<sample message> Mitel IP handsets - Not Configured No Service

For general enquiries or fault reporting please contact the IT Service Desk.


Related links

Handset instructions
for desk phone

Trinity telephone instrument instructions

User Guide for Mitel 6865i

User Guide for Mitel 6867i

Installing IP handset via Network Port

Voicemail Instructions

Conference Calls Instruction

Mobile phone information Trinity mobile phone information - information about the Trinity mobile phones processes
Request Forms

Request voicemail for an existing internal phone extension

Request a new internal phone extension

Request to move an internal phone extension

Request to swap an internal phone extensions

Change the access levels of an internal phone extension

Change line type to IP request form

Request a new telephone instrument, no new extension required


Need further help?

Search the Knowledge Base for how-to’s and answers to commonly asked questions

Phone: +353 (01) 896 2000
Web Portal:
(see how to log or check an enquiry at

Please be aware of the IT Service Desk opening hours