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Cisco ASA 5500 Series Configuration Guide using ASDM
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Chapter 41 Information About Cisco Unified Communications Proxy Features
Licensing for Cisco Unified Communications Proxy Features
Table 41-2 shows the default and maximum TLS session details by platform.
The following table shows the Unified Communications Proxy license details by platform for
intercompany media engine proxy:
ASA 5550 Base License: 2 sessions
1
.
Optional licenses: 24, 50, 100, 250, 500, 750, 1000, 2000, or 3000 sessions.
ASA 5580 Base License: 2 sessions
1
.
Optional licenses: 24, 50, 100, 250, 500, 750, 1000, 2000, 3000, 5000, or 10,000 sessions.
2
1. Phone Proxy, Presence Federation Proxy, and Encrypted Voice Inspection applications use TLS proxy sessions for their connections. Each TLS proxy
session is counted against the UC license limit. All of these applications are licensed under the UC Proxy umbrella, and can be mixed and matched. Some
applications might use multiple sessions for a connection. For example, if you configure a phone with a primary and backup Cisco Unified
Communications Manager, there are 2 TLS proxy connections, so 2 UC Proxy sessions are used.
Note: Mobility Advantage Proxy does not require a license, and its TLS proxy sessions do not count towards the UC license limit.
The maximum number of UC sessions you can use also depends on the TLS proxy session limit:
- For license part numbers ending in “K8” (for example, licenses under 250 users), TLS proxy sessions are limited to 1000.
- For license part numbers ending in “K9” (for example, licenses 250 users or larger), the TLS proxy limit depends on your configuration and the platform
model. To configure the TLS proxy limit, use the Configuration > Firewall > Unified Communications > TLS Proxy pane.
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 K8 licenses, SRTP sessions are limited to 250.
- For K9 licenses, there is not limit.
Note: Only calls that require encryption/decryption for media are counted towards the SRTP limit; if passthrough is set for the call, even if both legs are
SRTP, they do not count towards the limit.
2. With the 10,000-session license, the total combined sessions can be 10,000, but the maximum number of Phone Proxy sessions is 5000.
Model License Requirement
Table 41-2 Default and Maximum TLS Sessions on the Security Appliance
Security Appliance Platform Default TLS Sessions Maximum TLS Sessions
ASA 5505 10 80
ASA 5510 100 200
ASA 5520 300 1200
ASA 5540 1000 4500
ASA 5550 2000 4500
ASA 5580 4000 13,000
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