Supported Supplementary Features for IPv6 Fallback Scenario
Question
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.)
Answers
Explanations
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A. B. C. D. E.AC.
https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cusrst/admin/sccp_sip_srst/configuration/guide/SCCP_and_SIP_SRST_Admin_Guide/To enable IPv6 in a unified SRST gateway to support SIP phones, the gateway should have support for IPv6 fallback scenarios. IPv6 fallback is a feature that allows the network to continue operating using IPv4 in the event that the IPv6 infrastructure fails or is unavailable.
The following are the two supported supplementary features for an IPv6 fallback scenario in a unified SRST gateway to support SIP phones:
B. Secure SIP Lines: Secure SIP lines are used to provide secure communication between SIP devices and a SIP server. This feature is important in an IPv6 fallback scenario because it ensures that communications between SIP phones and the SRST gateway remain secure even if the IPv6 infrastructure is not available.
E. SIP Trunk: SIP trunking is the use of VoIP to facilitate the connection of a private branch exchange (PBX) to the Internet. In an IPv6 fallback scenario, the SIP trunk feature can be used to connect the SRST gateway to a SIP provider or to another PBX using IPv4. This allows for continued communication even if the IPv6 infrastructure is unavailable.
The other options (A. three-way conference, C. T.38 fax relay, and D. transcoding) are not directly related to IPv6 fallback scenarios and are not supported features for IPv6 fallback in a unified SRST gateway to support SIP phones.
In summary, to enable IPv6 in a unified SRST gateway to support SIP phones, the supported supplementary features for an IPv6 fallback scenario are secure SIP lines and SIP trunk.
