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The IMG 2020 supports the SIP Refer method of transferring calls. This method utilizes the Refer-To Header field to pass contact information such as URI INFO provided in the request. The IMG 2020 has the ability to act as either a Transferee or a Transfer Target when used as part of the SIP Call Transfer functionality between three SIP User Agents. The IMG 2020 cannot become a Transferor. This will be left to an application written on a different server. Below is a short description of the three functions.
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Basic Transfer (Unattended)
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A) A connection between Transferor and Transferee is established through dialog.
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Only Blind Transfer can be accomplished if the call is transferred back to the PSTN side. |
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A) A dialogue between the Transferee and Transferor is established
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Call has successfully been transferred to PSTN using SIP Refer
Transfer (Attended)
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A) A connection between Transferor and Transferee is established through dialog.
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The procedure below explains how to configure SIP Refer and Delayed Answer functionality. Before configuring the SIP Refer and Delayed Answer functions, the IMG 2020 must first have an initial or basic configuration created on it. Refer to the Basic Configurations procedure. The Basic Configurations procedure describes how to configure the basic functions required prior to configuring the SIP Refer and Delayed Answer functionality. Also, since this is utilizing the SIP protocol, a SIP signaling stack must be configured. Refer to the Configure SIP (Single SIP IP) or Configure SIP (Multiple SIP IP) for information on configuring the SIP stack.
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Right click on the Profiles object and select New SIP Profiles. The SIP Profiles object is a parent or container object. No configuration is needed 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. In the SIP Profile object that appears, either enter a name that identifies this SIP Profile or accept the default name already entered. In this example the SIP Profile was labeled SIP_REFER_Profile. Refer to the SIP Profile - SGP topic for more information on configuring the remaining fields in this object.
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Right click on the SIP Profile object just created and select New SIP REFER Support. Enable the REFER Support functionality by selecting Enabled from the drop down menu of the REFER Support field.
In the From Header in INVITE triggered by REFER field, select either Referred-by or Original Caller. Refer to the SIP Profile - Refer Support topic.
(Optional) Configure the Delayed Answer functionality
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Right click on the Dialogic object and select New Routing Configuration. The Routing Configuration object is a parent or container object and no configuration is required in this object. Refer to Routing Configuration topic for more information on this object.
Right click on Routing Configuration and select New Channel Groups. The Channel Groups object is a parent or container object as well which allows multiple channel groups to be created under it. No configuration required in this object either. Refer to the Channel Groups topic for more information on this object.
Right click on Channel Groups object and select New Channel Group. In the name field, either accept the default name provided or enter a name that will identify the channel group being created.
Select SIP from the drop down menu of the Signaling Type field. Refer to the Channel Group topic for more information for more information on configuring a SIP channel group.
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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 here. For more information on this object refer to the External Network Elements topic.
Right click on External Network Elements and select New External Gateways. The External Gateways object is also a container object and no configuration is needed here either. For more information on this object refer to the External Gateways topic.
Right click on External Gateways object and select New External Gateway. In the Name field, enter a name that identifies this gateway. In this procedure, REFER_GW was entered as the name
Select SIP from drop down menu in the Protocol field.
Select either Gateway IP Address or Gateway Host name from the Address Type field. In this procedure the IP Address will be how the IMG 2020 will communicate with external gateway.
Enter the IP address of the external gateway in the IP Address field.
Select the SIP Profile created earlier from the drop down menu of the Profile field . Refer to screen capture below.
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Refer to the External Gateway topic for information on configuring the remaining fields in this object.
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At this point, the Translations and Routing can be configured. Refer to the Routing Overview topic for more information on this.
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