In a SIP REFER-based call transfer, which SIP message is being used by the recipient to notify the originator that the final recipient was successfully contacted?
A. 200 OK
B. NOTIFY with a message body of 200 OK
C. 202 Accepted
D. 100 Trying
E. 200 BYE
In a SIP REFER-based call transfer, which SIP message is being used by the recipient to notify the originator that the f
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In a SIP REFER-based call transfer, which SIP message is being used by the recipient to notify the originator that the f
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