The SIP DTMF Trigger Detection and Notification functionality enables the SBC Core to look for specific DTMF trigger patterns and to notify an external SIP entity when such patterns are detected.

If a mid-call trigger is configured for a call, it is activated as soon as the call is connected. When the SBC Core detects DTMF input matching the pattern criteria of the trigger, it sends the DTMF input in an SIP INFO message to the SIP call peer with content type application/DTMF.

Possible values are:

  •  Egress
  •  Ingress

To View DTMF Trigger

On the SBC main screen, go to Configuration > Profile Management > Category: DTMF Trigger Profile > DTMF Trigger.

The DTMF Trigger window is displayed.

To Edit DTMF Trigger

To edit a DTMF Trigger in the list, click the radio button next to the specific DTMF Trigger name.

The Edit Selected DTMF Trigger window is displayed below.


Parameter

Length/Range

Description

Name

Up to 23 characters

Specifies the DTMF name.

State

N/A

Specifies the administrative state of this DTMF trigger.

  • Disabled (default)
  • Enabled

Pattern

0-30

Indicates the pattern in the digit-regular expression for the SBC Core to match. You can string multiple comma-separated patterns together. If you do not enter a pattern value, S# is assumed as the default value.

Interdigit
Timeout

0-65535

Specifies the interdigit timer (maximum time between digits) in milliseconds. If 0 is specified, the timer is disabled. The default value is 4000.

Longdigit
Duration

0-65535

Specifies the duration in milliseconds for a digit to be considered long. If 0 is specified, long digits are disabled. The default value is 2000.

Make the required changes and click Save.


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