A collaboration engineer is troubleshooting a delay in call completion on a SIP Cisco Unified
Border Element gateway. The gateway is set up for dual stack IP with DNS as the dial peer target.
In DNA, AAAA and A records are configured for the target. The engineer determines that IPv4
calls should remain IPv4, when possible, to temporary resolve the issue. The company is testing
some IPv6 applications so the engineer cannot disable IPv6 altogether. Which configuration can
the engineer apply to the Cisco Unified Border Element to accomplish this temporary fix?

A.
sip-ua
Protocol mode ipv4

B.
voice service voip
Sip
No anat

C.
voice service voip
No allow-connections ipv4 to ipv6

D.
sip-ua
Protocol mode dual-stack preference ipv4

E.
voice service voip
Sip
Preference ipv4