SIP INFO Method - Long Call Duration Auditing

The feature Long Call Duration Auditing uses the SIP INFO Method to verify whether a call is in progress. When the IMG 2020 receives a SIP INFO request with id and tags that match an active call, a 200 OK response indicating that the call is in progress will be sent from the IMG 2020. If the IMG 2020 receives a SIP INFO request with id and tags that do not match an active call, then a response of 481 Call Leg/Transaction Does Not Exist is sent from the IMG 2020. The initiator of the SIP message will then be able to determine if the call is up or not. Below are call flows for each scenario.

Call Flow 1

The call is in progress and Dialog was found. The IMG 2020 sends back a 200 OK message

Open

Call Flow 2

The call is no longer in progress and Dialog was not found. The IMG 2020 sends back a 481 Call Does not exist message.

Open

Configuration

Initial Configuration

The procedure below explains how to configure the SIP INFO Method - Long Call Auditing functionality on the IMG 2020. Before configuring, the IMG 2020 must have an initial configuration created on it. Refer to the Basic Configurations procedures in the topic before proceeding.

Create SIP Signaling Gateway Profile (SGP)

Create a SIP Profile and SIP DTMF support objects.

• 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 object.

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

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

• Right click on the SIP Profiles object again and select New SIP Profile. Either enter a Name into the name field that identifies this profile or accept the default entry. The name entered in this procedure was INFO_Method_LCDA

• Click in the INFO Keep-Alive Support field and select Enabled from drop down menu. This will enable the Long Call Duration Auditing feature. The INFO Keep-Alive field is by default set to Disabled. Refer to the SIP Profile - SGP topic for more information on configuring the individual fields.

Create a SIP Remote Gateway

The External Gateway object must be created and configured to communicate with an outgoing Channel Group. The gateway being configured will need the SIP Profile with the Info-Keep Alive Support functionality configured in it. To link the SIP profile created above to a remote SIP gateway, an external network element must also be created. The next few sections describe how to configure this.

• 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 procedure, the name entered was SIP_LongCallDur_GW. Refer to the screen capture and table below.

Configure SIP Signaling

The configuration above displays how to configure the SIP Profile and External SIP Gateway so that the INFO Method - Long Call Duration Auditing 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.