SIP_ISDN Interworking

The SIP_ISDN Interworking object is used to interwork the Call Proceeding message from the ISDN side to the 183 Session Progress with SDP message when the value of the Progress Indicator parameter in the Call Proceeding message is either "1" or "8". By interworking these parameters, an early voice path can be established so the caller can hear a prompt played by the terminating endpoint. If no progress indicator is present or the value of the ISDN Progress Indicator is not "1" or "8" then the call will proceed as normal. The Call Proceeding message will be dropped and no SIP 183 Session Progress will be sent. If the feature is not configured, interworking the ISDN Call Proceeding message to the SIP leg is based on <draft-kotar-sipping-dss1-sip-iw-01.txt> section 7.3.2. The receipt of a DSS1 CALL PROCEEDING message SHALL NOT result in any SIP message being sent.

The SIP_ISDN Interworking object which is created under the SIP Profile (SGP) object is used to configure the ISDN Call Proceeding to SIP 183 Progress Interworking feature. The SIP_ISDN Interworking object will configure the functionality on the SIP side for this feature. To complete the configuration of the ISDN Call Proceeding to SIP 183 Progress feature, the Call Proceeding IW Procedure field in the ISDN Group object must be configured also. For configuration information on the ISDN Call Proceeding to SIP 183 Progress Interworking feature, refer to the Map ISDN Call Proceeding to SIP 183 topic.

Web GUI Page

IMG EMS > Profiles > SIP SGP > New SIP_ISDN Interworking

Maximum Objects

One SIP_ISDN Interworking object per SIP Profile (SGP) object

Field Descriptions

Call Proceeding IW Procedure

Disabled (Default) - When set to Disabled, the ISDN Call Proceeding to SIP 183 Progress Interworking functionality is disabled. The IMG 2020 will NOT interwork the Progress Indicator parameter no matter what its values is.

Enabled - When set to Enabled, the ISDN Call Proceeding to SIP 183 Progress functionality is enabled on the SIP side. The ISDN Progress Indicator will be interworked into the SIP 183 PROGRESS message if the Progress Indicator value is either No. 1 or No. 8. After enabling the SIP_ISDN Interworking object, the SIP Profile (SGP) that this object is being configured under can now be inserted into the SIP External Gateway object. For more information, refer to the Map ISDN Call Proceeding to SIP 183 topic link in the Related Topics section above.

Tel URI for Outgoing request URI for incoming ISDN

To enable the tel URI usage in SIP INVITE for ISDN incoming call, user must create another SIP profile in which it will enable the "Tel URI for Outgoing request URI for incoming ISDN" property.

Disabled (Default) - When set to Disabled, it will be read only in the SIP Default profile.

Enabled - When set to Enabled, a receiving ISDN call would be interworked to SIP with the outgoing SIP INVITE using tel: URI.

Use anonymous in From header incoming ISDN Null dialed number

To enable the use of anonymous in From header for incoming ISDN Null dialed number.

Disabled (Default) - When set to Disabled, the From header will have the following format.

From: "unavailable"<sip:unavailable@ip_address;user=phone>

Enabled - When set to Enabled, the From header will have the following format.

From: "anonymous" <sip:anonymous@anonymous.invalid>

ISDN to SIP-T Interworking

To enable the ISDN to SIP-T interworking feature.