Cisco ASA 5505 Configuration Manual page 885

Chapter 38 Configuring Inspection for Voice and Video Protocols
Security Level—Select the security level (high or low).
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Modes
The following table shows the modes in which this feature is available:
Firewall Mode
Routed
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Low—Default.
Registration: Not enforced.
Maximum message ID: 0x181.
Minimum prefix length: 4
Media timeout: 00:05:00
Signaling timeout: 01:00:00.
RTP conformance: Not enforced.
Medium
Registration: Not enforced.
Maximum message ID: 0x141.
Minimum prefix length: 4.
Media timeout: 00:01:00.
Signaling timeout: 00:05:00.
RTP conformance: Enforced.
Limit payload to audio or video, based on the signaling exchange: No.
High
Registration: Enforced.
Maximum message ID: 0x141.
Minimum prefix length: 4.
Maximum prefix length: 65536.
Media timeout: 00:01:00.
Signaling timeout: 00:05:00.
RTP conformance: Enforced.
Limit payload to audio or video, based on the signaling exchange: Yes.
Message ID Filtering—Opens the Messaging ID Filtering dialog box for configuring message
ID filters.
Customize—Opens the Add/Edit SCCP (Skinny) Policy Map dialog box for additional settings.
Default Level—Sets the security level back to the default level of Low.
Security Context
Transparent Single
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Multiple
Context System
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Cisco ASA 5500 Series Configuration Guide using ASDM
Skinny (SCCP) Inspection
38-39