I've attached configurations for a UC520 phone system and Cisco ASA 5510 firewall where the system is colo'd at a data center and no users connect directly to the phone system over the LAN.
Summary Points:
The Cisco UC520 phone system sits in a data center with a 10Mbps Internet feed.
All users on this phone system are remote users connecting with Cisco IP Communicators and Cisco SPA-525G phones.
Every user on the system connects their PC, laptop, or SPA525G phone by first initiating an SSL VPN connection. The SSL VPN sessions terminate on a Cisco ASA 5510 firewall
The Cisco ASA 5510 firewall was used to terminate SSL VPN sessions to get around the limit of 10 VPN tunnels on the UC520. Purchased a 25-user SSL VPN license for the ASA.
No users are located at the data center where the system resides.
Just found this post and will be stealing as much as I can of it. Looking at hosting some phones remotely, most on site, but also behind an ASA because of all of the tunnel needs.
Thank you!
-Mark
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