In the H.323 protocol suite, which protocol is responsible for call control?

Question

Options

• AH.225
• BH.235
• CH.245
• DH.450

• A
  81% (35)
• B
  5% (2)
• C
  12% (5)
• D
  2% (1)

Explanation

H.225 handles call control signaling in H.323, using Q.931-based messages to manage call setup, connect, and teardown between endpoints - making it the call control protocol in the suite. H.245 is the common distractor because it also plays a major role, but its job is media control: negotiating capabilities and opening/closing logical channels after the call is established, not controlling the call itself. H.235 is the security framework for H.323, covering authentication and encryption, so it has no direct role in call control. H.450 defines supplementary services like call transfer, call hold, and call waiting - useful features layered on top of a call, but not call control itself.

Memory tip: Think of H.225 as "2 call, 5 ive me a line" - it's what actually dials the call. H.245 you can remember as handling the media (the "4" in 245 → "for" the audio/video streams), while H.235 = security (S is the 19th letter; close enough to 235), and H.450 = add-ons (supplementary extras on top).

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