To upgrade eSpace IP phones in batches in DHCP Option 246 mode, obtain the IP addresses of the IP phones through () after the IP phones are powered on.

Question

Options

• AHTTP server
• BFile server
• CDHCP server
• DU1900 unified gateway

• A
  8% (4)
• B
  4% (2)
• C
  73% (36)
• D
  14% (7)

Explanation

When an IP phone powers on, it has no IP address yet and must request one from a DHCP server - this is the foundational step before any other network communication can occur. In DHCP Option 246 mode, the DHCP server not only assigns the IP address but also delivers Option 246 data (such as the configuration/upgrade server address), making it the single source of truth at boot time.

Why the distractors are wrong:

• A (HTTP server): HTTP servers deliver files/web content, but a phone needs an IP address before it can reach an HTTP server.
• B (File server): File servers store and share files; IP address assignment is outside their role entirely.
• D (U1900 unified gateway): The U1900 handles voice/media functions; it does not assign IP addresses to endpoints.

Memory tip: Think "DHCP first, everything else second" - a device with no IP address cannot talk to any other server (HTTP, file, or gateway). DHCP is always Step 1 on the network.

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