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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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