FreePBX, being a front end to Asterisk, allows setting multiple time periods under a single Time Group, usually for public Holidays and such, we call this Holidays - I know, so original
This article concentrates on Queensland, in particular Brisbane, Public Holidays, since only a few holidays vary between states, it will be easy for you to change to suite yours if you need to, likewise international readers, where many don't observe Show Days, ANZAC Day, or Easter.
Before I continue, let me reassure you the UCM's do work, the devices are just restrictive, hardware and configurability wise, one of the most common complaints I hear is with Music On Hold, in our markets, the most popular method is streaming, be it a plug-in radio, or remote stream, and the UCM's can't do it.
So your business is running an old analog multi-line PABX that you've used and trusted for years, you've also just been letter dropped that the NBN is ready for service in your area, ok, so that means you have 18 months to migrate to an NBN service before Telstra cuts off your existing copper services, you know it's wise to move sooner rather than later because you don't want to get caught out and be without a phone service when everyone waits till the last minute, and there's not enough techs to go round.
You decide you better start talking to some RSP's (Retail Service Providers), or worse - you get one of those pesky door to door sales people, either way, during your conversations all of a sudden your ears prick up because you've just been told that your trusty existing PABX wont work, it's incompatible with the NBN and you need to replace it.
To Host or not to Host - That is the question. Since the time SIP was commercialised, there has been a religious war raging, a fierce war with two staunch opponents - On-Prem (on-site) PBXers, and Hosted (off-site) PBXers.
There are benefits to both methods, it depends on what features you want, how many channels you need (in the world of VoIP, channels = lines), and how you are going to use the system.
TPG and ABB (Aussie Broadband) need no introduction, but the shite way one of them does business and treats its customers is the chalk to the others cheese.
Long time socials followers, would be well aware of the frustrations and problems I've had to tolerate with TPG. I took up their service in 2010 as a static-IP account, yet after about 6 years, TPG forgot the meaning of static-IP and changed our IP - without notice - not once, but three times. This is a problem when your IP Address is in many firewall ACL's to perform remote management.
In breaking news, Sangoma have announced that Multi Factor Authentication for FreePBX, a commercial module with a hotly contentious ongoing yearly fee, will from April 1 2025, be completely free, for FreePBX users, and no, this I'm assured isn't an April Fools teaser.
FreePBX, being a front end to Asterisk, allows setting multiple time periods under a single Time Group, usually for public Holidays and such, we call this Holidays - I know, so original 
Before I continue, let me reassure you the UCM's do work, the devices are just restrictive, hardware and configurability wise, one of the most common complaints I hear is with Music On Hold, in our markets, the most popular method is streaming, be it a plug-in radio, or remote stream, and the UCM's can't do it.
So your business is running an old analog multi-line PABX that you've used and trusted for years, you've also just been letter dropped that the NBN is ready for service in your area, ok, so that means you have 18 months to migrate to an NBN service before Telstra cuts off your existing copper services, you know it's wise to move sooner rather than later because you don't want to get caught out and be without a phone service when everyone waits till the last minute, and there's not enough techs to go round. 
To Host or not to Host - That is the question. Since the time SIP was commercialised, there has been a religious war raging, a fierce war with two staunch opponents - On-Prem (on-site) PBXers, and Hosted (off-site) PBXers.
TPG and ABB (Aussie Broadband) need no introduction, but the shite way one of them does business and treats its customers is the chalk to the others cheese.