300-810 · Question #36
In the integration of Cisco Unity Connection using SIP, which SIP trunk security profile option is required for MWI to work correctly?
The correct answer is C. Accept unsolicited notification. In a SIP integration between Cisco Unity Connection and CUCM, MWI is communicated using SIP NOTIFY messages sent from Unity Connection to CUCM (and ultimately to the phones). These NOTIFY messages are 'unsolicited' in certain configurations - meaning they are not preceded by a SI
Question
In the integration of Cisco Unity Connection using SIP, which SIP trunk security profile option is required for MWI to work correctly?
Options
- AAccept out-of-dialog refer
- BAccept replaces header
- CAccept unsolicited notification
- DAccept presence subscription
How the community answered
(57 responses)- B2% (1)
- C95% (54)
- D4% (2)
Explanation
In a SIP integration between Cisco Unity Connection and CUCM, MWI is communicated using SIP NOTIFY messages sent from Unity Connection to CUCM (and ultimately to the phones). These NOTIFY messages are 'unsolicited' in certain configurations - meaning they are not preceded by a SIP SUBSCRIBE from the receiving side. For CUCM to accept and process these out-of-subscription NOTIFY messages on the SIP trunk, the SIP Trunk Security Profile must have 'Accept unsolicited notification' enabled (option C). Without this setting, CUCM will reject the NOTIFY messages and MWI lamps will not function. The other options - Replaces header, out-of-dialog REFER, and presence subscription - are unrelated to MWI NOTIFY handling.
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