A lot depends on the size of the property and the amenities needed. I have installed Mitel, Panasonic, and PhoneSuite.
I like them all, but the Mitels are all the older variety, and every time I work on the oldest, I swear it's my last!
For the Panasonic systems, they are cost effective if you're installing them in an independent property. The flags tend to not like them, and they have a ways to go if you want PMS and guest voice mail. DuVoice makes an add-on with a price tag that rivals the PBX cost. It will push that low-cost system over the edge in a sub-100 room property.
PhoneSuite makes a cost effective solution for 16-450 rooms. It's weakness is in the multi-line sets. For
competitive money, you get PMS and SMDR, and guest voice mail that clears when you check a new room in or at checkout as you choose the option.
The last version of Mitel I worked with (ML/EL family) everything was done via MOSS and you could not have SMDR and PMS at the same time. Supersets are sweet, but a Mitel can't so something as simple as a lobby, pool, or elevator phone ring a group of extensions. I suppose with Supersets you could construct something that would, I just didn't find the time to do it. We used Viking external dialers to make it work.
I could give you tips about wireless internet, but that's a different thread.
LkEErie
call group that has several extensions in it