Chapter 17 Configuring the Cisco Phone Proxy

Prerequisites for the Phone Proxy

For more information about licensing, see Chapter 5, “Managing Feature Licenses.” in the general operations configuration guide.

Prerequisites for the Phone Proxy

This section contains the following topics:

•Media Termination Instance Prerequisites, page 17-6

•Certificates from the Cisco UCM, page 17-7

•DNS Lookup Prerequisites, page 17-7

•Cisco Unified Communications Manager Prerequisites, page 17-7

•ACL Rules, page 17-7

•NAT and PAT Prerequisites, page 17-8

•Prerequisites for IP Phones on Multiple Interfaces, page 17-9

•7960 and 7940 IP Phones Support, page 17-9

•Cisco IP Communicator Prerequisites, page 17-10

•Prerequisites for Rate Limiting TFTP Requests, page 17-10

•End-User Phone Provisioning, page 17-11

Media Termination Instance Prerequisites

The ASA must have a media termination instance that meets the following criteria:

•You must configure one media termination for each phone proxy on the ASA. Multiple media termination instances on the ASA are not supported.

•For the media termination instance, you can configure a global media-termination address for all interfaces or configure a media-termination address for different interfaces. However, you cannot use a global media-termination address and media-termination addresses configured for each interface at the same time.

•If you configure a media termination address for multiple interfaces, you must configure an address on each interface that the ASA uses when communicating with IP phones.

For example, if you had three interfaces on the ASA (one internal interface and two external interfaces) and only one of the external interfaces were used to communicate with IP phones, you would configure two media termination addresses: one on the internal interface and one on the external interface that communicated with the IP phones.

•Only one media-termination address can be configured per interface.

•The IP addresses are publicly routable addresses that are unused IP addresses within the address range on that interface.

•The IP address on an interface cannot be the same address as that interface on the ASA.

•The IP addresses cannot overlap with existing static NAT pools or NAT rules.

•The IP addresses cannot be the same as the Cisco UCM or TFTP server IP address.

Cisco ASA Series Firewall ASDM Configuration Guide

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Cisco Systems ASA 5580, ASA 5505 manual Prerequisites for the Phone Proxy, Media Termination Instance Prerequisites, 17-6
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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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