Which of the following statements is CORRECT about the IP PBX when the CDR pool is full?

Question

Options

• ANo more calls are available.
• BIntra-office calls can be made.
• COutgoing calls can be made.
• DCalls from external can be answered.

• A
  7% (3)
• B
  5% (2)
• C
  15% (6)
• D
  73% (30)

Explanation

When the CDR (Call Detail Record) pool is full, the IP PBX can no longer log new call records for billing and auditing purposes. Since incoming calls from external sources are passively received rather than originated by the PBX, the system still allows them to be answered - the PBX prioritizes reachability over record-keeping for inbound traffic.

Why the distractors are wrong:

• A (No more calls) is too absolute - only call types that require CDR logging to proceed are affected, not all calls universally.
• B (Intra-office calls) are blocked because internal calls still generate CDRs; without storage space, they cannot be logged and are therefore denied.
• C (Outgoing calls) are also blocked for the same reason - the PBX cannot record the call detail, so it refuses to route the call out.

Memory tip: Think of CDR as a toll booth log. If the log book is full, the toll booth (PBX) won't let cars leave (outgoing) or pass internally, but cars arriving from the highway outside (external callers) can still pull in - you're never supposed to leave someone stranded on the road just because your paperwork is full.

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