Question 15:
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.)
Answer options:
A. three-way conference B. secure SIP lines C. T.38 fax relay D. transcoding E. SIP trunk