Sunday, July 10, 2011

Access Cisco Unity Express from the internet with private addressing

Your Cisco Unity Express Voicemail system is connected to your Cisco Callmanager Express via private addressing? And you need to access it via the Internet? No VPN available?
Well, I had this task waiting for me. Not really complicated, but somebody might find it useful ....

interface GigabitEthernet0/0
 description Internet
 ip address
 ip nat outside
interface ISM0/0
 ip unnumbered Loopback0
 ip nat inside
 service-module ip address
 !Application: CUE Running on ISM
 service-module ip default-gateway
ip nat inside source list CUE_OUT interface GigabitEthernet0/0 overload
ip nat inside source static tcp 80 9999 extendable
ip route
ip route ISM0/0
!This gives your CUE access to public services (SMTP, DNS, ...)
ip access-list extended CUE_OUT
 deny   ip host host
 permit ip host any

Now you only need to enter this URL in your browser:

If there is a firewall in between , filtering all ports except for SIP traffic & SSH), you could set up an SSH Tunnel to fix that problem. See

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