Chapter 21 Configuring Cisco Intercompany Media Engine Proxy

Guidelines and Limitations

Model

License Requirement

All models

Intercompany Media Engine license.

 

When you enable the Intercompany Media Engine (IME) license, you can use TLS proxy sessions up

 

to the configured TLS proxy limit. If you also have a Unified Communications (UC) license installed

 

that is higher than the default TLS proxy limit, then the ASA sets the limit to be the UC license limit

 

plus an additional number of sessions depending on your model. You can manually configure the TLS

 

proxy limit using the Configuration > Firewall > Unified Communications > TLS Proxy pane. If

 

you also install the UC license, then the TLS proxy sessions available for UC are also available for

 

IME sessions. For example, if the configured limit is 1000 TLS proxy sessions, and you purchase a

 

750-session UC license, then the first 250 IME sessions do not affect the sessions available for UC. If

 

you need more than 250 sessions for IME, then the remaining 750 sessions of the platform limit are

 

used on a first-come, first-served basis by UC and IME.

•For a license part number ending in “K8”, TLS proxy sessions are limited to 1000.

•For a license part number ending in “K9”, the TLS proxy limit depends on your configuration and the platform model.

Note K8 and K9 refer to whether the license is restricted for export: K8 is unrestricted, and K9 is restricted.

You might also use SRTP encryption sessions for your connections:

•For a K8 license, SRTP sessions are limited to 250.

•For a K9 license, there is no limit.

Note Only calls that require encryption/decryption for media are counted toward the SRTP limit; if passthrough is set for the call, even if both legs are SRTP, they do not count toward the limit.

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

Guidelines and Limitations

Context Mode Guidelines

Supported in single context mode only.

Firewall Mode Guidelines

Supported in routed firewall mode only.

IPv6 Guidelines

Does not support IPv6 addresses.

Additional Guidelines and Limitations

Cisco Intercompany Media Engine has the following limitations:

•Fax is not supported. Fax capability needs to be disabled on the SIP trunk.

•Stateful failover of Cisco Unified Intercompany Media Engine is not supported. During failover, existing calls traversing the Cisco Intercompany Media Engine Proxy disconnect; however, new calls successfully traverse the proxy after the failover completes.

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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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