There is only a tested list, most of the SIP hardphoes should work with IP Office.
Every SIP phone i can lay hands on i have connected to IP Office, no one failed until now.
These are until now Siemens SIP set, SNOM, a few Samsung including a WiFi SIP phone and Cisco SIP phones.
by NAT i mean 2 or more remote subnets using public ip network addressing translation tables to port forward and allow through firewall settings of main site PBX on private LAN. All devices behind NAT. No VPN phone.
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