Rtsp Inspection Overview - Cisco ASA Series Configuration Manual
Firewall cli, asa services module, and the adaptive security virtual appliance
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Also See for ASA Series:
- Cli configuration manual (2164 pages) ,
- Getting started (31 pages) ,
- Mount and connect (12 pages)
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Chapter 14
Inspection for Voice and Video Protocols
The following is sample output from the show mgcp sessions command.
hostname# show mgcp sessions
1 in use, 1 most used
Gateway IP host-pc-2, connection ID 6789af54c9, active 0:00:11
The following is sample output from the show mgcp sessions detail command.
hostname# show mgcp sessions detail
1 in use, 1 most used
Session active 0:00:14
RTSP Inspection
The following sections describe RTSP application inspection.
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RTSP Inspection Overview
The RTSP inspection engine lets the ASA pass RTSP packets. RTSP is used by RealAudio,
RealNetworks, Apple QuickTime 4, RealPlayer, and Cisco IP/TV connections.
For Cisco IP/TV, use RTSP TCP ports 554 and 8554.
Note
RTSP applications use the well-known port 554 with TCP (rarely UDP) as a control channel. The ASA
only supports TCP, in conformity with RFC 2326. This TCP control channel is used to negotiate the data
channels that are used to transmit audio/video traffic, depending on the transport mode that is configured
on the client.
The supported RDT transports are: rtp/avp, rtp/avp/udp, x-real-rdt, x-real-rdt/udp, and x-pn-tng/udp.
The ASA parses Setup response messages with a status code of 200. If the response message is traveling
inbound, the server is outside relative to the ASA and dynamic channels need to be opened for
connections coming inbound from the server. If the response message is outbound, then the ASA does
not need to open dynamic channels.
Because RFC 2326 does not require that the client and server ports must be in the SETUP response
message, the ASA keeps state and remembers the client ports in the SETUP message. QuickTime places
the client ports in the SETUP message and then the server responds with only the server ports.
Media IP
192.168.5.7
Media port
6058
Gateway IP
host-pc-2
Call ID
9876543210abcdef
Connection ID
6789af54c9
Endpoint name
aaln/1
Media lcl port
6166
Media rmt IP
192.168.5.7
Media rmt port
6058
RTSP Inspection Overview, page 14-17
RealPlayer Configuration Requirements, page 14-18
Limitations for RSTP Inspection, page 14-18
Configure RTSP Inspection, page 14-18
Cisco ASA Series Firewall CLI Configuration Guide
RTSP Inspection
14-17
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Troubleshooting
