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Refer to the exhibit. Which SIP message will trigger the calling device to open channels for early media reception?

Posted: Sat Jul 23, 2022 7:01 pm
by answerhappygod
Refer to the exhibit.

Which SIP message will trigger the calling device to open channels for early media reception?
Refer To The Ex 1
Refer To The Ex 1 (97.9 KiB) Viewed 63 times
A. 180 Ringing
B. ACK
C. INVITE
D. 183 session-progress
E. 200 ok