Configuring SIP-to-ISDN Release Cause Mapping

The Release Cause Mapping from SIP to ISDN table lets you configure up to 12 SIP response code to ISDN ITU-T Q.850 release cause code (call failure) mapping rules. The table lets you override the default SIP-to-ISDN release cause mappings, listed in Fixed Mapping of SIP Response to ISDN Release Reason. When the device receives a SIP response from the IP side, it searches the table for a matching SIP response. If found, the device sends the corresponding Q.850 Release Cause to the PSTN. If the SIP response is not configured in the table, the default, fixed SIP-to-ISDN release reason mapping is used.

For Tel-to-IP calls, you can also map less commonly used SIP responses to a single, default ISDN release cause code, using the [DefaultCauseMapISDN2IP] parameter. The parameter defines a default ISDN cause code that is always used, except when the following Release Causes are received: Normal Call Clearing (16), User Busy (17), No User Responding (18) or No Answer from User (19).

The following procedure describes how to configure SIP-to-ISDN release cause mapping through the Web interface. You can also configure it through ini file [CauseMapSIP2ISDN] or CLI (configure voip > gateway manipulation cause-map-sip2isdn).

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To configure a SIP-to-ISDN release cause mapping rule:

Open the Release Cause Mapping from SIP to ISDN table (Setup menu > Signaling & Media tab > Gateway folder > Manipulation > Release Cause SIP > ISDN).

Click New; the following dialog box appears:

Configure a mapping rule according to the parameters described in the table below.

Click Apply.

Release Cause Mapping from SIP to ISDN Table Parameter Descriptions

Parameter	Description
'Index' [Index]	Defines an index number for the new table row. Note: Each row must be configured with a unique index.
'SIP Response' sip-response [SipResponse]	Defines the SIP response code. For example, you can enter "406" (without quotation marks) to represent the SIP 406 Not Acceptable response.
'Q.850 Causes' q850-causes [IsdnReleaseCause]	Defines the ISDN Q.850 cause code. For example, you can enter "6" (without quotation marks) to represent Cause Code 6 Channel Unacceptable.

Parameter

Description

'Index'

[Index]

Defines an index number for the new table row.

Note: Each row must be configured with a unique index.

'SIP Response'

sip-response

[SipResponse]

Defines the SIP response code. For example, you can enter "406" (without quotation marks) to represent the SIP 406 Not Acceptable response.

'Q.850 Causes'

q850-causes

[IsdnReleaseCause]

Defines the ISDN Q.850 cause code. For example, you can enter "6" (without quotation marks) to represent Cause Code 6 Channel Unacceptable.