What is the meaning of the option 'sip-port' in the Tserver" section in 'options' tab of the SIP server?

A: It is the port used by SIP Server to communicate with other T-lib clients such as URS, StatServer, etc B: It is the port used by SIP Server to communicate with other SIP devices such as Media Server, SIP Endpoints, Gateways etc. using SIP signaling only C: It is the port used by SIP Server to communicate using SNMP protocol with a NMS software D: It is the port used by SIP Server to communicate with other SIP devices such as Media Server, SIP Endpoints, gateways etc. using RTP/RTCP protocol E: It is the port used by SIP Server to communicate with other SIP devices such as Media Server, SIP Endpoints, F: Gateways etc. using both RTP/RTCP protocol and SIP signaling.