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A customer is looking to take advantage of the flexibility that a Nortel Solution provides them. They currently have a Communication Server (CS) 1000 Rls. 4.5 network with eight PBX systems connected via IP Peer Networking and the H.323 Protocol. Which options are valid when migrating the customer's network to SIP trunking between the sites? (Choose three.)
A. Add SIP Access Ports to each CS 1000 system on the network to enable SIP Trunking.
B. Add SIP Access Port Licenses to each of the existing NRS Platforms on the network.
C. Enable the SIP Proxy Service on each of the CS 1000 Signaling Server Gateways.
D. Enable and configure SIP Redirect/Registrar Services on the existing Network Routing Servers (NRS).
E. Enable and configure the SIP Gateway Services on the various CS 1000 Signaling Server system endpoints.
Answer:ADE