Need to acquire an IP PBX and extensions phones

[treascor]

Hello, this is our situation we are creating:

10 home-offices each with an individual ph# (we need to buy the IP phones)
10 cell phone# (already available)
1 main office phone # (ip phone to still to buy)

What devices would you suggest if we were to create these options:

OPTION-A (during business hours)
1) client calls the main line
2) call forwarded to the specific home-office or cell ph#


OPTION-B (during business hours)
1) client calls the main line
2) IVR reads instructions and client digits extensions
3) call automatically forwarded to home-office or cell-ph#


OPTION-C (outside business hours)
1) when office is closed an IVR guides the client to select specific options, eventually to leave a voicemail


Max budget available: $3500

[GreenLantern]

Desktop Phones: Yealink T46 or T48 https://amzn.to/2R0Km8t

Cordless Phones (if needed): Yealink W60P (starter kit) plus additional W56H (handsets) https://amzn.to/2QZXQ4r

Cloud PBX: www.nebulapbx.com