I have 1 SPA9000, 3 SPA400, 1 SPA962, 5 SPA942, 8 SPA922, 2 SPA941, 1 WIP310, 3 SPA901 and 2 PAP2T, connected in 3 different offices,
using VPN, I have more than 16 phones, for the first 16 phones everything it´s working fine, for the rest I´m getting not registerd, so I want to install 1 SPA9000 per office, my doubt is if this can work like having 1 SPA9000.?
You can have 3 SPA9000, but not behaving as a single unit. You would need to connect 1 SIP trunk to each of the neighbors (i.e. two SIP trunks).
- Need to manipulate SPA9000 call routing rule, so that e.g. any number starting with 2 is routed to office 2 and any number starting with 3 to office 3.
- On the contact list of the SPA9000 line you need to setup DID rules so that numbers can dial in and out between extensions.
The solution will work well for basic SIP call control, but things like call pickup, BLF, shared lines, call park/unpark will not work between offices. Same as directory, each SPA9000 will host their own directory. As a suggestion use the personal directory to introduce the office's numbers.
If you are not expert on SPA9000 dial plan, I strongly suggest you read the SPA9000 administration guide and familiarize with call routing rule, dial plan as well as DID mapping.