Setting SIP Call Duration and Inactive Media Timeout

The call duration and inactive media timeout features help you to conserve network resources and maximise throughput.

You use the maximum-call-duration parameter to set the maximum allowable length of time a call can be active. When the duration is exceeded, the SIP ALG tears down the call and releases the media sessions. This setting also frees up bandwidth in cases where calls fail to properly terminate.

This parameter indicates the maximum length of time (in seconds) a call can remain active without any media (RTP or RTCP) traffic within a group. Each time an RTP or RTCP packet occurs within a call, this timeout resets. When the period of inactivity exceeds this setting, the SIP ALG temporary openings (pinholes) in the firewall opened for media are closed. The default setting is 120 seconds, the range is from 10 to 2550 seconds. Note that upon timeout, while resources for media (sessions and pinholes) are removed, the call is not terminated.

Note: You must use the CLI to set SIP-signaling and media-inactivity timeouts.

Use either the J-Web or CLI configuration editor.

This topic covers:

• J-Web Configuration
• CLI Configuration
• Related Topics

J-Web Configuration

1. Select Configuration > View and Edit > Edit Configuration > Security > ALG > SIP.
2. Enter a value for any of the following parameters:
3. C timeout
4. Inactive media timeout
5. Maximum call duration
6. T1 interval
7. T4 interval
8. Click one of the following buttons:
   • To apply the configuration and return to the main Configuration page, click OK.
   • To apply the configuration, click Commit.
   • To cancel your entries and return to the main page, click Cancel.

CLI Configuration

In the following example, you set call duration to 3000 minutes and the media inactivity timeout to 90 seconds:

Related Topics

• Understanding SIP ALG Call Duration and Timeouts
• Configuring SIP Denial of Service (DoS) Attack Protection
• Allowing Unknown SIP Message Types