Cisco 400-051 Exam

Which H.245 information is exchanged within H.225 messages in H.323 Fast Connect?

  • A. Terminal Capability Set
  • B. Open Logical Channel
  • C. Master-Slave Determination
  • D. Call Setup
  • E. Call Progress
Answer: Option B. 
Explanation: 

With the standard H.245 negotiation, the two endpoints need three round-trips before they agree on the parameters of the audio/video channels (1. master/slave voting, 2. terminal capability set exchange, and finally, 3. opening the logical channels). In certain situations and especially with highlatency network links, this can last too long and users will notice the delay.

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