Cisco 7604 Configuration Guide - Page 501
Media Connection Clear on 4xx/5xx/6xx SIP Messages, timeout sip-disconnect
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Chapter 22 Applying Application Layer Protocol Inspection SIP Inspection Figure 22-15 Media Connection Clear on 4xx/5xx/6xx SIP Messages UAC Firewall Service Module (FWSM) UAC INVITE 100 Trying 180 ringing with SDP 200 OK 4XX response Media CONN entry generate on FWSM ACK 191379 Media CONN entry is tear down after receiving Error(4xx-6xx) response Media CONN entry existing time In Figure 22-15, the media connections are cleared immediately when 200 OK is received in response for 4xx/5xx/6xx SIP messages. If 200 OK is not received, the media connection is cleared after the timeout sip-disconnect occurs. It is possible to extend the timeout for provisional responses. The timeout for pinholes receiving 1xx/2xx responses is configurable, or configured based on the EXPIRE field. When the EXPIRE field exists in the SIP INVITE message, and is less than 30 minutes, the timeout for pinholes for receiving 1xx/2xx responses is set to the EXPIRE field value. If the EXPIRE field value in the SIP INVITE header is greater than 30 minutes, the timeout for provisional responses is set to 30 minutes. In the absence of the EXPIRE field in the SIP INVITE message, the timeout for provisional responses is set to the value configured using the timeout sip-invite command. OL-20748-01 Catalyst 6500 Series Switch and Cisco 7600 Series Router Firewall Services Module Configuration Guide using ASDM 22-85
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