SSCA SIP Protocols & Call Flow Fundamentals 2

Question 1

Which SIP response code indicates that the request has been received and is being processed, but no final response has been sent?

Accepted Answer

100 Trying

Answer

100 Trying is a provisional response indicating the request was received and is being forwarded to the next hop.

Question 2

In SIP, what is the purpose of the 'branch' parameter in the Via header?

Accepted Answer

To identify the transaction uniquely

Answer

The 'branch' parameter is a transaction ID that uniquely identifies each transaction, and must start with 'z9hG4bK' in RFC 3261.

Question 3

What SIP method is used to query the capabilities of a SIP endpoint without establishing a session?

Accepted Answer

OPTIONS

Answer

The OPTIONS method allows a client to query a server about its supported methods, extensions, and codecs.

Question 4

Which header in a SIP INVITE carries the session description (media parameters)?

Accepted Answer

Content-Type: application/sdp in the body

Answer

SIP carries session description via an SDP body, with the Content-Type header set to application/sdp.

Question 5

A SIP BYE request terminates which type of dialog?

Accepted Answer

An established INVITE dialog

Answer

BYE is sent within an established INVITE dialog to terminate an active session.

(SSCA) Sip School Certified Associate Practice Test