Extension/User Capacity
A single IP500 V2/V2A Expansion can support 384 users and up to 384 Analog/digital/IP
extensions (H.323, SIP and or DECT R4). Analog and digital extension capacity is dependent
upon the hardware fitted to the system.
• Maximum users and extensions are configuration limits as well as a currently active/
registered limit.
• Extension and user limits include any resilience fail-over extensions/users; again these are
configuration limits as well as a currently active/registered limit.
• Extension capacity support includes IP Office acting as a server for any DHCP, upgrade and
other operational files. 1600/9600/J100 phone upgrade performance is limited to 50 within 50
minutes for the same phone type.
• Upgrading more than 50 phones at a time from an IP500 V2/V2A is not recommended. If
upgrade performance above these figures are required, an external HTTP/S server can be
used.
• For non-subscription systems, H323, DECT R4 and SIP extension capacity is also limited by
available licenses.
• 9600 H323 Remote worker extensions are supported at a lower capacity; maximum 120.
• 9600 H323 extensions with TLS are supported at a lower capacity; maximum 128. That is,
each VoIP extension that uses TLS reduces the extension capacity by 3.