Virtual SNR in Cisco Unified Communications Manager Express

AB.

To configure a virtual SNR DN on Cisco Unified SCCP IP phones, perform the following steps: Prerequisites - Cisco Unified CME 9.0 or a later version.

Restrictions - -> Virtual SNR DN only supports Cisco Unified SCCP IP phone DNs.

-> Virtual SNR DN provides no mid-call support.

Mid-calls are either of the following: "" Calls that arrive before the DN is associated with a registered phone and is still present after the DN is associated with the phone.

"" Calls that arrive for a registered DN that changes state from registered to virtual and back to registered.

-> Mid-calls cannot be pulled back, answered, or terminated from the phone associated with the DN.

-> State of the virtual DN transitions from ringing to hold or remains on hold as a registered DN.

References: http://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucme/admin/configuration/guide/cmeadm/cmesnr.html#pgfId-1012065

Virtual SNR (Single Number Reach) in Cisco Unified Communications Manager Express (CUCME) allows users to receive calls made to a single phone number on multiple devices such as IP phones, softphones, and even mobile phones. When a call is made to a user's phone number, the system will ring all the configured devices until the call is answered or forwarded to voicemail.

Let's go through each statement to determine which two are true.

A. The SNR DN must be configured as SCCP. This statement is true. The SNR DN (Directory Number) must be configured using the Skinny Client Control Protocol (SCCP) signaling protocol. This is because SCCP is the signaling protocol used by Cisco IP phones to communicate with CUCME.

B. Calls cannot be pulled back from the phone associated with the DN. This statement is also true. Once a call has been forwarded to an SNR device, it cannot be pulled back to the original phone associated with the DN.

C. Ephone hunt groups are supported. This statement is false. Ephone hunt groups are not supported with virtual SNR in CUCME. Ephone hunt groups are used to distribute calls to a group of phones based on a specific hunt algorithm. Virtual SNR is a feature that forwards calls to multiple devices associated with a single phone number, and hunt groups are not needed.

D. The virtual SNR DN must be assigned to an ephone. This statement is true. The virtual SNR DN must be assigned to an ephone (Ethernet phone) in CUCME. An ephone is a software representation of a physical IP phone that is registered to CUCME. The virtual SNR DN is associated with the ephone, and when a call is made to that number, it is forwarded to all the configured devices associated with that ephone.

E. Music on hold is supported for trunk and line side calls. This statement is false. Music on hold is not supported for trunk and line side calls with virtual SNR in CUCME. Trunk and line side calls are calls that are made from one phone system to another or calls that are made through a gateway. Virtual SNR is a feature that is specific to CUCME and does not apply to trunk or line side calls.

In summary, the two statements that are true about virtual SNR in Cisco Unified Communications Manager Express are: A. The SNR DN must be configured as SCCP. D. The virtual SNR DN must be assigned to an ephone.