Vector steps, announcements, Computer Telephony Integration (CTI) applications, and other design components affect the performance of the processor and the Busy Hour Call Completion (BHCC) ratings. SIP trunks might require up to 60 percent more processing power when compared to the H.323 and TDM trunks.

Call Center Elite supports a total extension count of 64,000. VDNs function as extensions. Hence, if you administer 30,000 VDNs, you must balance the following count:

• 9,000 extension numbers in the dial plan that are used for announcements or music sources

• 30,000 potentially administered EAS agent login IDs

The following indicate the current CTI throughput for each Communication Manager instance when connected to Application Enablement Services (AES):

• 2,000 messages per second for AES 5.2 and later

• 24 domain-control associations per call

• 6 active associations per call, skill, and VDN domain

• 50,000 event notification associations

For information about capacity, see Avaya Aura® Communication Manager System Capacities Table on the Avaya Support website at http://support.avaya.com.