SIP is an application-layer protocol independent of the transport-layer protocols. It can be carried over different transport protocols, such as UDP, TCP, TLS, and SCTP. Currently, SCTP is the most commonly used transport-layer protocol.
Answer(s): B
While SIP is transport-agnostic and can run over UDP, TCP, TLS, or SCTP, UDP remains the predominant transport - SCTP is not the most commonly used.
In the SIP protocol, the Via header field indicates the route of the subsequent response message.
Answer(s): A
The Via header tracks each hop of the request and is used to guide the response back along the same path.
The Record-Route header field indicates the route of a request.
The Record-Route header is inserted by proxies to advertise their desired route for subsequent requests in the dialog.
During a point-to-point call between different GKs, the local GK sends an LRQ request to the neighboring GK to query the information about the called node.
In H.323, when a gatekeeper needs to locate an endpoint outside its zone, it issues a LocationRequest (LRQ) to the neighboring gatekeeper to retrieve the called party's address.
FILL BLANKAssume endpoints T1 and T2 are registered with the same SC node zone (signaling routing is disabled on the SC). After T1 calls the number of T2 using H.323, T1 and T2 communicate with each other. In this process, a total of ____________ TCP connection(s) need to be established between T1 and T2.(Enter an Arabic numeral.)
H.323 sets up one TCP connection for H.225 call signaling (Q.931) and a second TCP connection for the H.245 control channel, totaling two TCP connections.
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