Virtual SNR DN Configuration in Cisco Unified Communications Manager Express Router

E.

Virtual SNR DN (Single Number Reach Directory Number) is a feature in Cisco Unified Communications Manager Express (CUCME)-enabled Cisco IOS routers that enables a single phone number to ring on multiple devices. When the virtual SNR DN feature is enabled, an incoming call to the specified number is extended to a designated list of phone numbers.

Regarding the given options, the correct statement is:

B. A virtual SNR DN is a DN that is associated with multiple registered IP phones.

Explanation:

Option A is incorrect because a virtual SNR DN supports both SCCP and SIP IP phone DNs, not just one of them.

Option C is incorrect because the SNR feature does not allow calls in progress to be pulled back from the phone that is associated with the virtual SNR DN.

Option D is partly correct because the SNR feature can only be invoked if the virtual SNR DN is associated with at least one registered IP phone, but it can also be associated with multiple registered IP phones.

Option E is incorrect because a call that arrived before a virtual SNR DN is associated with a registered phone can still be answered from the phone that receives the call.

Therefore, the correct option is B, which states that a virtual SNR DN is a DN that is associated with multiple registered IP phones. This means that an incoming call to the virtual SNR DN will simultaneously ring on all the phones associated with it, allowing the user to answer the call from any of the registered devices.