In a Multiway call escalation, which SIP message is sent from the Multiway initiator to the participants to provide the bridge URI?
A. TRANSFER
B. REFER
C. REDIRECT
D. 200 OK
In a Multiway call escalation, which SIP message is sent from the Multiway initiator to the participants to provide the bridge URI?
A. TRANSFER
B. REFER
C. REDIRECT
D. 200 OK