Which three options are valid when Cisco Unified Customer Voice Portal comprehensive call flow and survivability service handles SIP REFER? (Choose three.)

Question

Options

• ASIP trunk alternate destination routing (ADR) must be disabled for REFER
• BAn application-controlled alternative is to set an ECC variable (user.sip.refertransfer) to the value
• CRouter require on a failed SIP Refer transfer where the survivability service is not handling the
• DDirect Refer transfer using label works only if Send To VRU node is NOT used before the Refer
• EUnified ICM sends Unified CVP a routing label with a format of rfXXXX
• FStandalone Cisco Unified CVP with ICM Lookup label

• A
  13% (7)
• B
  80% (45)
• D
  5% (3)
• F
  2% (1)

Explanation

In Cisco Unified CVP's SIP REFER handling, option B is correct because user.sip.refertransfer is a legitimate ECC variable that gives script designers application-level control over REFER transfer behavior - it's a documented alternative to label-based transfer. Option C is correct because when a SIP REFER transfer fails and the CVP survivability service is not in scope, Unified ICM's router re-queues (requires) the call to find an alternate routing path. Option E is correct because Unified ICM signals CVP to execute a REFER transfer by sending a routing label in the specific rfXXXX format (e.g., rf5001), which CVP interprets as a REFER instruction rather than a standard transfer label.

Why the distractors are wrong:

• A is incorrect - ADR does not need to be disabled; it can coexist with REFER handling.
• D is incorrect - Direct REFER using a label is not blocked by prior use of the Send To VRU node; that restriction does not apply here.
• F is incorrect - Standalone CVP with ICM Lookup is a deployment topology, not a valid SIP REFER handling option.

Memory tip: Think BCE = "REFER's three pillars" - Behavior via ECC variable, Call re-route on failure, Exact label format (rf). The rf prefix in option E is the clearest giveaway - whenever you see a routing label that starts with rf, CVP knows to issue a SIP REFER.

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