CISCO 300-815 Exam Question 30

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A company has an SRST gateway running an IOS XE image. The company plans to enable the IPv6 addressing companywide. To enable the IPv6 in a unified SRST gateway to support SIP phones, what are two supported supplementary features for an IPv6 fallback scenario? (Choose two.)
A. three-way conference
B. secure SIP lines
C. T.38 fax relay
D. transcoding
E. SIP trunk
Correct Answer: AC