300-810 · Question #55
Which SIP request type is used by Cisco Unity Connection to inform Cisco Unified Communications manager that the Message Waiting Indicator must be turned on or off for a specific line?
The correct answer is A. NOTIFY. SIP NOTIFY is the message type used to deliver event notifications within the SIP SUBSCRIBE/NOTIFY framework (RFC 3265). For MWI (Message Waiting Indicator), Cisco Unity Connection sends an unsolicited SIP NOTIFY request to Cisco Unified Communications Manager containing a…
Question
Which SIP request type is used by Cisco Unity Connection to inform Cisco Unified Communications manager that the Message Waiting Indicator must be turned on or off for a specific line?
Options
- ANOTIFY
- BUPDATE
- CSUBSCRIBE
- DPUBLISH
How the community answered
(28 responses)- A89% (25)
- C7% (2)
- D4% (1)
Explanation
SIP NOTIFY is the message type used to deliver event notifications within the SIP SUBSCRIBE/NOTIFY framework (RFC 3265). For MWI (Message Waiting Indicator), Cisco Unity Connection sends an unsolicited SIP NOTIFY request to Cisco Unified Communications Manager containing a 'message-summary' event body that specifies whether new voicemail messages are waiting. CUCM then lights or extinguishes the MWI lamp on the corresponding phone line. UPDATE modifies an in-progress session and has no role in MWI. SUBSCRIBE is sent by a client to request notifications - it's CUCM that may send SUBSCRIBE to CUC, but CUC uses NOTIFY to deliver the MWI status. PUBLISH is used to push presence state to a presence server and is unrelated to MWI.
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