With Cisco Unified Communications Manager Express running on the Cisco 2921ISR G2, how many phones can be supported?

Question

Options

• A35
• B50
• C100
• D150

• A
  3% (1)
• B
  3% (1)
• C
  90% (27)
• D
  3% (1)

Explanation

Option C (100 phones) is correct because the Cisco 2921 ISR G2 running CME is documented to support a maximum of 100 IP phones - this is a specific platform limit tied to the router's processing capacity and memory ceiling for CME.

Why the distractors are wrong:

• A (35) matches smaller platforms like the Cisco 2901 or 1941, not the 2921.
• B (50) is associated with the Cisco 2911 ISR G2, one step below the 2921 in the lineup.
• D (150) is the capacity of the 2951 ISR G2, the next model up in the 2900 series.

Memory tip: Think of the 2900 series as a staircase - 2901/2911 supports ~50, 2921 supports 100, 2951 supports 150. Each step up roughly doubles or adds 50 phones. If you remember "2921 = 100," you anchor the whole series.

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