Which PBX Sip system? ( seeking purchase advice/ setup and administrtion)

we have four separate network sites connected up via ssl vpn

all sites internet speed are minimum:
Download 50 mbps
Upload 15 mbps

Max Simultaneous calls at any one time: 20

Hardware we already own:
Vertical VW-E5000i-8 ip phones x 10 ip phones

existing infrastructure:
Old building with old wiring analogue phones qty 50 (not able to rewire the building)
20 office desk workstations that have cat 5 rj45 connections good for ip phones
of the above 20 about 10 employers work whilst out of office using android or apple mobiles

happy to answer any other questions
About the recuiter
Member since May 20, 2018
Manas Borthakur
from Aveyron, France

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