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In this scenario, the User Agents (UAs) are both SIP-enabled phones.

In this scenario, the User Agents (UAs) are both SIP-enabled phones. What is the correct order of this basic SIP message flow?

1)The UAC initiates the session with an INVITE.

2)The UAS sends a 200 OK message indicating that the request has succeeded.

3)Media is exchanged bidirectionally.

4)The UAS sends a 100 Trying response back to the UAC

5)The UAC sends a BYE message. This is followed by a 200 OK final response message sent by the UAS.

6)The UAS sends a 180 Ringing message.

7)The UAC sends an ACK message confirming that it has received a final response to INVITE.

A.

1,2,4,6,7,5,3

B.

1,4,6,2,7,3,5

C.

1,7,4,6,3,2,5

D.

1,4,2,7,6,3,5

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