See below for a list of suitable software to use with Irish VoIP numbers. Note Irish VoIP numbers can also be used with a Cloud PBX to make and receive calls.
Android / Apple IOS (download from store)
Bria Mobile (Most Recommended as it works for Push Messaging in background)
https://www.irishvoip.com/index.php/knowledgebase/137/How-to-use-Bria-Mobile-with-my-Call-Plan.html
Zoiper https://www.zoiper.com/
Windows
Microsip (Most Recommended) http://www.microsip.org/
Ekiga http://www.ekiga.org
3CX http://www.3cx.com/voip/sip-phone/
Blink http://www.icanblink.com
SFLPhone http://www.sflphone.org
Yate http://yate.null.ro/pmwiki/index.php?n=Main.Download
Linux
Blink http://www.icanblink.com
SFLPhone http://www.sflphone.org
Ekiga http://www.ekiga.org
Yate http://yate.null.ro/pmwiki/index.php?n=Main.Download
Apple Mac
Telephone https://itunes.apple.com/en/app/telephone/id406825478
Blink http://www.icanblink.com
Yate http://yate.null.ro/pmwiki/index.php?n=Main.Download
For details on how to configure your number for use with FreePBX see below
