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Table of Contents
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The IMG 2020 supports interworking between SIP and SIP-T. A call originates in the PSTN can be interworked into a SIP network by placing the ISUP messaging into the SIP message body. When the call finally gets to its destination, the ISUP information is extracted from SIP message and placed back into ISUP messaging format so PSTN can now route the call.

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