I want to use in the headquarter an SPA-8800 to be conected with my Panasonic PBX using the FXO interfaces, and in the branch offices I want to use ATA-186 to receive the extension from the Panasonic in an analog phone.
I do not know if the SPA-8800 and the ATA-186 can communicate using SIP without a Proxy Server.
Attached is a diagram of the solution
Could anybody tell me if my idea could be implemented? or what I have to use
The SPA8800 supports 4 FXS/FXO ports, so you can connect up to 4 ports, either to 4 SPA2102 (each using one port only) or 2 SPA2102 (each using the two ports). Depends more on number of locations (if you have one location then two SPA2102).
Do you want to use the 186 for any specific reason? This is a non-tested configuration so I'm not 100% sure it will work.
If possible, I would suggest to change the ATA 186 by SPA2102 in each place. SPA2102 is very affordable and works properly with SPA8800.
Please note I'm not saying It will not work, but I don't know, maybe other people in the forum can provide the right answer