I understand that the limitations is due to the number of VPN tunnels supported by the device. But if the tunnels are created with another device and the UC500 acts as a PBX-IP. it´s possible connect more than 5 UC500 trough IP trunks?
In that scenario, there is no limit in the number of sites you can deploy. But, as you mention, CLI is required.
Yes, I know that even though only 5 sites are officially supported, it is possible to have more than 5 sites, even though Multisite Manager supports only 5 sites. You will have to do a manual multisite configuration in order to have more than 5 sites, where site-to-site VPNs are configured through CLI. The UC520 and UC540 models support up to 10 VPN tunnels, and the UC560 supports up to 20 VPN tunnels.
Future versions of CCA might have official support for more than 5 sites, where each site has one of the following:
- An UC560
- An UC520, UC540, or UC560 behind a SA520 or SA540
- An UC520, UC540, or UC560 behind a SR520-ADSL or SR520-FE