When a call is placed from a Cisco VCS registered SIP-only endpoint to an H.323-only endpoint, which type of call license is consumed?

Question

Options

• Atraversal call
• Bnon-traversal call
• Con-net call
• Dinterworking call
• Eoff-net call
• FCisco Unified Workspace Licensing

• A
  85% (39)
• B
  2% (1)
• C
  7% (3)
• D
  2% (1)
• F
  4% (2)

Explanation

On Cisco Video Communication Server (VCS), when a call is placed between a SIP endpoint and an H.323 endpoint, protocol interworking must occur - the VCS translates signaling and media between the two incompatible protocols. To perform this interworking, the VCS must insert itself into the media path (acting as a Back-to-Back User Agent, or B2BUA), relaying and converting the media streams. Because the media flows through the VCS rather than directly between endpoints, this is functionally equivalent to a traversal call, and therefore a traversal call license is consumed. A non-traversal (or 'registered') call license only applies when the VCS handles signaling only and media flows directly between endpoints - which cannot happen when protocol conversion is required.

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