Refer to the exhibit. Calls from users to the PSTN in an organization get disconnected with a 408 Request Timeout when the called party is unavailable to pick up the call. Which solution must be used to resolve this challenge?
A.
Configure midcall-signaling preserve-codec.
B.
Choose "Send PRACK" if 1xx contains SDP in the SIP profile.
C.
Configure midcall-signaling passthru media-change.
D.
Choose "Send PRACK for all 1xx Messages" in the SIP profile.
CUCM is already PRACK enabled - as you can see in the call flow, 10.61.64.254 already sends a PRACK (103). The media has been requested to be changed mid-call - most likely - Answer is C
Hard to say which one as both B. and D. are correct, however D. is safer, but cause more network traffic.
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