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The IMG 2020 supports the SIP INFO Method. The SIP INFO Method is designed to transmit application level control information such as DTMF tones along the SIP signaling path. Transport of DTMF signaling is of great importance since there is a large existing base of DTMF applications. The transmitting of tones is achieved during a call and is independent of the RTP or Media Stream. The mid-session signaling information is transported over the signaling path. This method allows information such as DTMF digits to be transported in a reliable way. Consider a phone banking application for example. After a user is asked by an IVR to enter an amount to be transferred the user then enters the digits consecutively. If the IVR does not receive one of the DTMF digits or the digit order changes due to out-of-order delivery, the transaction may result in an unpredictable money transfer. Thus, a reliable transport channel is desired. The SIP INFO method uses the underlying SIP reliability and in-order delivery of information makes DTMF signaling resilient to unreliable packet delivery even under bursty loss.

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The procedure below explains how to configure SIP INFO Method - DTMF on the IMG 2020. Before configuring, the IMG 2020 must have an initial configuration created on it. Follow the Basic Configurations procedure before proceeding. 

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• Right click on the Dialogic object and select New Profiles. The Profiles object is a parent or container object and no configuration is needed here. Refer to the Profiles topic for more information on this topic.

• Right click on the Profiles object and select New SIP Profiles. The SIP Profiles object is a parent or container object also and no configuration is required here. Refer to the SIP Profiles topic for more information on this object.

• Right click on the SIP Profiles object and select New SIP Profile. The first profile that gets created is a Default SIP Profile and cannot be modified. Disregard this profile.

• Right click on the SIP Profiles object and select New SIP Profile again. Either enter a Name into the name field that identifies this profile or accept the default entry. In this procedure, the SIP Profile was labeled SIP_INFO_Method_DTMF_Profile. Refer to the SIP Profile - SGP topic for more information on configuring the remaining fields in this object.

• Right click on the SIP Profile object just created and select SIP DTMF Support. The Method field in the SIP DTMF Support object is by default set to Disable. Select either INFO with Pattern, Subscribe, or Info DTMF digit relay from drop down menu. Refer to the SIP Profile - DTMF Support topic for more information on configuring the remaining fields.

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• Right click on the Dialogic object and select New External Network Elements. The External Network Elements object is a container object and no configuration is needed in this object. Refer to External Network Elements for more information.

• Right click on External Network Elements object and select New External Gateways. The External Gateways object is also a container object. Under the External Gateways object, multiple individual gateways can be created. Refer to External Gateways topic for more information.

• Right click on External Gateways and select New External Gateway. In the name field either enter a name that identifies the gateway being configured or accept the default name. In this example, the name given was SIP_INFO_DTMF_GW Refer to the screen capture and table below.

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The configuration above displays how to configure the SIP Profile and External SIP Gateway so that the SIP INFO Method - DTMF functionality is configured. The next step is to configure the SIP signaling stack and SIP Channel Groups. Refer to the Configure SIP (Single SIP IP) topic for a procedure on how to configure the SIP functionality.

Configure TDM side

Refer to Configure SS7 for information on configuring the SS7/TDM side including stacks and channel groups. 

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