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18-14
Cisco ASA Series Firewall ASDM Configuration Guide
Chapter 18 Configuring the TLS Proxy for Encrypted Voice Inspection
CTL Provider
The Manage CA Certificates dialog box opens. See the “Guidelines and Limitations” section on
page 40-10 in the general operations configuration guide. Click Add to open the Install Certificate
dialog box. See the “Configuring CA Certificate Authentication” section on page 40-12 in the general
operations configuration guide.
When you are configuring the TLS Proxy for the Phone Proxy, click Install TLS Server’s Certificate
and install the Cisco Unified Call Manager (CUCM) certificate so that the proxy can authenticate the IP
phones on behalf of the CUCM server.
Step 6 To require the ASA to present a certificate and authenticate the TLS client during TLS handshake, check
the Enable client authentication during TLS Proxy handshake check box.
When adding a TLS Proxy Instance for Mobile Advantage (the CUMC client and CUMA server), disable
the check box when the client is incapable of sending a client certificate.
Step 7 Click Apply to save the changes.
Edit TLS Proxy Instance – Client Configuration
Note This feature is not supported for the Adaptive Security Appliance version 8.1.2.
The TLS Proxy enables inspection of SSL encrypted VoIP signaling, namely Skinny and SIP, interacting
with Cisco Call Manager and to support the Cisco Unified Communications features on the ASA.
The fields in the Edit TLS Proxy dialog box are identical to the fields displayed when you add a TLS
Proxy instance. Use the Edit TLS Proxy – Client Configuration tab to edit the client proxy parameters
for the original TLS Client, such as IP phones, CUMA clients, the Cisco Unified Presence Server
(CUPS), or the Microsoft OCS server.
Step 1 Open the Configuration > Firewall > Unified Communications > TLS Proxy pane.
Step 2 To edit a TLS Proxy Instance, click Edit.
The Edit TLS Proxy Instance dialog box opens.
Step 3 If necessary, click the Client Configuration tab.
Step 4 To specify a client proxy certificate to use for the TLS Proxy, perform the following. Select this option
when the client proxy certificate is being used between two servers; for example, when configuring the
TLS Proxy for Presence Federation, which uses the Cisco Unified Presence Server (CUPS), both the TLS
client and TLS server are both servers.
a. Check the Specify the proxy certificate for the TLS Client... check box.
b. Select a certificate from the drop-down list.
Or
To create a new client proxy certificate, click Manage. The Manage Identify Certificates dialog box
opens. See the “Configuring Identity Certificates Authentication” section on page 40-24 in the
general operations configuration guide.