Chapter 16 Using the Cisco Unified Communication Wizard

Configuring the Phone Proxy by using the Unified Communication Wizard

•PC Port

•Voice VLAN access

•Gratuitous ARP

•Span to PC Port

Step 3 To configure address translation for IP phones, check the Enable address translation for IP phones check box. Select whether to use the IP address of the ASA private interface (which you selected in step 2 of the wizard) or enter an IP address.

Configuring address translation for IP phone configures the address used by the IP phones. All traffic from the outside network converges into one source IP address so that, if there is another corporate firewall in the network, a pinhole needs to be opened only for that IP address rather than for all traffic.

Step 4 To configure an HTTP proxy for the Phone Proxy feature that is written into the IP phone's configuration file under the <proxyServerURL> tag, do the following:

a.Check the Configure an HTTP proxy to redirect phone URLs... check box.

b.In the IP Address field, type the IP address of the HTTP proxy

c.In the Port field, enter the listening port of the HTTP proxy.

The IP address you enter should be the global IP address based on where the IP phone and HTTP proxy server is located. You can enter a hostname in the IP Address field when that hostname can be resolved to an IP address by the adaptive security appliance (for example, DNS lookup is configured) because the adaptive security appliance will resolve the hostname to an IP address. If a port is not specified, the default will be 8080.

d.In the Interface field, select the interface on which the HTTP proxy resides on the adaptive security appliance.

Setting the proxy server configuration option for the Phone Proxy allows for an HTTP proxy on the DMZ or external network in which all the IP phone URLs are directed to the proxy server for services on the phones. This setting accommodates nonsecure HTTP traffic, which is not allowed back into the corporate network.

Step 5 Click Next.

Configuring the Media Termination Address for Unified Communication Proxies

The data from this step generates the MTA instance to be added to the Phone Proxy and the UC-IME proxy.

The phone proxy and the UC-IME proxy use the media termination address for Secure RTP (SRTP) and RTP traffic. SRTP traffic sent from external IP phones to the internal network IP phone via the ASA is converted to RTP traffic. The traffic is terminated on the adaptive security appliance. SRTP provides message authentication and replay protection to Internet media traffic such as audio and video. RTP defines a standardized packet format for delivering audio and video over the Internet.

For the UC-IME proxy and the Phone Proxy to be fully functional, you must ensure that the public IP address for the media termination address (MTA) is accessible from the Internet. The summary page of the Unified Communication Wizard reminds you of this requirement.

The MTA IP addresses that you specify must meet specific requirements. See Media Termination Instance Prerequisites, page 17-6for information.

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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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