Which SIP message header is used to tunnel QSIG messages across the SIP network when the OGW receives a call bound for the TGW?
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A. Content-TypE. application/sdp
B. Content-TypE. application/qsig
C. Content-TypE. message/ISUP
D. Content-TypE. message/external-body
E. Content-TypE. application/x-q931
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