When you troubleshoot H.323 call setup, which message informs you that the called party is being notified about the call?

The correct answer is A. ALERTING. The ALERTING message in H.323 (Q.931 signaling) is sent from the called endpoint back toward the calling endpoint to indicate that the destination device is ringing - i.e., the called party is being notified of the incoming call. This is the H.323 equivalent of SIP's '180 Ringing

Signaling and Call Control Protocols

Question

When you troubleshoot H.323 call setup, which message informs you that the called party is being notified about the call?

Exhibit

Options

AALERTING
BPROCEEDING
CCONNECT
DRINGING

How the community answered

(18 responses)

A
94% (17)
B
6% (1)

Explanation

The ALERTING message in H.323 (Q.931 signaling) is sent from the called endpoint back toward the calling endpoint to indicate that the destination device is ringing - i.e., the called party is being notified of the incoming call. This is the H.323 equivalent of SIP's '180 Ringing'. CALL PROCEEDING means the network has accepted the call setup request and is processing it (but the far end hasn't necessarily started ringing yet). CONNECT means the called party has answered. There is no standalone 'RINGING' message in H.323 Q.931 - ALERTING serves that purpose.

Topics

#H.323#Call Setup#Signaling Messages#Troubleshooting

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