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SIP proxies have operations defined in RFC 3261 and supporting extensions.

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SIP proxies have operations defined in RFC 3261 and supporting extensions. Though no lETF RFC completely defines how SBCs must function. SBCs evolved over the years.

Which two operations demonstrate the high-level differences between SBCs and SIP proxies? (Choose two.)

A.

Stateful proxies are context-aware and can terminate communication sessions by themselves

B.

SlP proxies add a Via header and optionally a Record-Route header, and the rest of the headers are left untouched

C.

SBCs can modify headers such as To, From, Contact, and Call-D.lt can introduce new headers into the SIP message

D.

SBCs are capable of interworking completely different protocols to set up, modify, and tear down communication sessions. It includes SIP, H.323,and MGCP protocols

E.

SIP proxies are SDP-aware and can change the SDP bodies

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