The system administrator has successfully integrated Cisco Unity Connection over a WAN with Cisco Unified Communication Manager using SIP. When a call to a subscriber is forwarded to voicemail. the caller correctly hears the subscriber greeting. During a recent WAN oversubscription event, instead of routing the calls via SIP directly to Unity Connection, the AAR feature was used to route the calls via the PSTN to Unity Connection This worked, however on forwarded calls, the caller no longer heard the subscriber’s greeting, but rather an auto attendant message that asked them to enter the extension of a party they want to reach. Which cause of callers not hearing the correct subscriber greeting is most likely true?

A.	The telephone carrier is not preserving RDNIS across the network
B.	AAR System Setting is not enabled in Unity Connection
C.	Unity Connection Restriction Tables is not permitting calls via the PSTN
D.	DTMF is not negotiated properly on this call