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ISDN Protocol Administrator's and Developer's Guide ... - Intervoice

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3In this chapter...▼ T1 Transfer Methods, 3-2▼ E1 Transfer Methods, 3-5Call TransferThis chapter discusses call transfer methods <strong>and</strong> the types ofprotocols that use each method.Each transfer type is classified several ways:• Single or two-line transfer• T1 or E1 span• connect UserDLL or no connect UserDLL60001262, First Edition 3-1

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