Chapter 18 Configuring the TLS Proxy for Encrypted Voice Inspection

CTL Provider

Configure TLS Proxy Pane

Note This feature is not supported for the Adaptive Security Appliance version 8.1.2.

You can configure the TLS Proxy from the Configuration > Firewall > Unified Communications > TLS Proxy pane.

Configuring a TLS Proxy lets you use the TLS Proxy to enable inspection of SSL encrypted VoIP signaling, namely Skinny and SIP, interacting with Cisco Call Manager and enable the ASA for the Cisco Unified Communications features:

•TLS Proxy for the Cisco Unified Presence Server (CUPS), part of Presence Federation

•TLS Proxy for the Cisco Unified Mobility Advantage (CUMA) server, part of Mobile Advantage

•Phone Proxy

Fields

•TLS Proxy Name—Lists the TLS Proxy name.

•Server Proxy Certificate—Lists the trustpoint, which is either self-signed or enrolled with a certificate server.

•Local Dynamic Certificate Issuer—Lists the local certificate authority to issue client or server dynamic certificates.

•Client Proxy Certificate—Lists the proxy certificate for the TLS client. The ASA uses the client proxy certificate to authenticate the TLS client during the handshake between the proxy and the TLS client. The certificate can be either self-signed, enrolled with a certificate authority, or issued by the third party.

•Add—Adds a TLS Proxy by launching the Add TLS Proxy Instance Wizard. See Adding a TLS Proxy Instance, page 18-9for the steps to create a TLS Proxy instance.

•Edit—Edits a TLS Proxy. The fields in the Edit panel area identical to the fields displayed when you add a TLS Proxy instance. See Edit TLS Proxy Instance – Server Configuration, page 18-13and Edit TLS Proxy Instance – Client Configuration, page 18-14.

•Delete—Deletes a TLS Proxy.

•Maximum Sessions—Lets you specify the maximum number of TLS Proxy sessions to support.

–Specify the maximum number of TLS Proxy sessions that the ASA needs to support.

–Maximum number of sessions—The minimum is 1. The maximum is dependent on the platform: Cisco ASA 5505 security appliance: 10

Cisco ASA 5510 security appliance: 100

Cisco ASA 5520 security appliance: 300

Cisco ASA 5540 security appliance: 1000

Cisco ASA 5550 security appliance: 2000

Cisco ASA 5580 security appliance: 4000

Note The maximum number of sessions is global to all TLS proxy sessions.

Cisco ASA Series Firewall ASDM Configuration Guide

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Cisco Systems ASA 5580, ASA 5505, ASA 5545-X, ASA 5555-X, ASA 5585-X, ASA Services Module manual Configure TLS Proxy Pane, 18-8
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ASA Services Module, ASA 5555-X, ASA 5545-X, ASA 5585-X, ASA 5580 specifications

Cisco Systems has long been a leader in the field of network security, and its Adaptive Security Appliance (ASA) series is a testament to this expertise. Within the ASA lineup, models such as the ASA 5505, ASA 5580, ASA 5585-X, ASA 5545-X, and ASA 5555-X stand out for their unique features, capabilities, and technological advancements.

The Cisco ASA 5505 is designed for small businesses or branch offices. It provides essential security features such as firewall protection, flexible VPN capabilities, and intrusion prevention. The ASA 5505 supports a user-friendly interface, allowing for straightforward management. Its built-in threat detection and prevention tools provide a layered defense, and with scalability in mind, it can accommodate various expansion options as organizational needs grow.

Moving up the line, the ASA 5580 delivers greater throughput and advanced security features. This model is suited for medium to large enterprises that require robust protection against increasingly sophisticated threats. Its multi-core architecture allows it to manage high volumes of traffic seamlessly while maintaining excellent performance levels. The ASA 5580 also supports application-layer security and customizable access policies, making it highly adaptable to diverse security environments.

The ASA 5585-X further enhances Cisco's security offerings with advanced malware protection and extensive security intelligence capabilities. It incorporates next-generation firewall features, including context-aware security, and supports advanced threat detection technologies. This model is ideal for large enterprises or data centers that prioritize security while ensuring uninterrupted network performance and availability.

For enterprises requiring a balance of performance and security, the ASA 5545-X presents a compelling option. This model features scalable performance metrics, high availability, and integrated advanced threat protection. Coupled with advanced endpoint protection and detailed monitoring capabilities, the ASA 5545-X enables organizations to manage their security posture effectively.

Lastly, the ASA 5555-X blends cutting-edge technologies with strong security infrastructures. It boasts high throughput and the ability to execute deep packet inspections. Its sophisticated architecture supports threat intelligence feeds that provide real-time security updates, making it a powerful tool against modern threats.

Each of these Cisco ASA models brings specific advantages to varied environments. Their integrative capabilities enable businesses to enhance their security postures while benefiting from seamless scalability and management. As cybersecurity threats evolve, these advanced appliances play a vital role in protecting valuable digital assets.
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