Which statements are correct? (Choose 2 answers)
A . With SIP Server, it is possible to use its internal registrar functionality and to instruct SIP server to contact an external registrar for registration process.
B . In a sip server stand-alone mode installation without a softswitch integration, it is not necessary to create a ‘switch’ object in CM
D . If an initiator of an S-participant conference on an MCU drops the call, the conference will soil continue without the dropped party.
E . SIP Server supports 3PCC with REFER method for two-step-transfer but not for single-step transfer.
Answer: C,D