Design Restriction for Cisco Unified Communications Manager Session Management Edition Clustering over the WAN Deployment

B.

Using only SIP trunks in the SME cluster allows you to deploy a "media transparent" cluster where media resources, when required, are inserted by the end or leaf Unified Communications system and never by SME.

Using only SIP trunks also allows you to use extended round trip times (RTTs) between SME nodes when clustering over the WAN.

Cisco Unified Communications Manager Session Management Edition (SME) is a component of the Cisco Unified Communications Manager (CUCM) that enables enterprise-wide call routing by interconnecting multiple CUCM clusters. When deploying CUCM SME clustering over the WAN with extended round-trip times in CUCM 9.1 and later releases, there are some design restrictions that need to be considered.

Answer D is correct, which states that a minimum of 1.544 Mb/s bandwidth is required for all traffic between any two nodes in the cluster. This means that the network link between any two nodes in the cluster should have a minimum bandwidth of 1.544 Mb/s or greater to ensure proper communication and avoid call quality issues.

Answer A, B, and C are incorrect as they refer to the types of intercluster trunks and gateways that are supported, which is not directly related to the design restriction for CUCM SME clustering over the WAN with extended round-trip times.

Answer E is also incorrect as it refers to RSVP agents, which are not directly related to the design restriction for CUCM SME clustering over the WAN with extended round-trip times. RSVP (Resource Reservation Protocol) is a protocol used for signaling QoS (Quality of Service) in IP networks and is not specific to CUCM SME clustering.

In summary, the correct answer to this question is D, which highlights the minimum bandwidth requirement of 1.544 Mb/s between any two nodes in the cluster for CUCM SME clustering over the WAN with extended round-trip times in CUCM 9.1 and later releases.