Cisco Systems ASA 5580 Manual De Usuario

For more information about licensing, see the general operations configuration guide.

This section contains the following topics:

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.