Cisco Cisco Customer Voice Portal 8.0(1) Guía De Diseño

This means you can run 1200 ports of Call Server doing SIP call control, and 1200 ports of VXML Server 
on one server with a 1200 port license.

An H.323 co-resident server can handle 500 H.323 calls as well as 500 VXML Server sessions 
simultaneously, and it can handle a sustained call arrival rate of 6 calls per second.

This means you can run 500 ports of Call Server doing H.323 call control, and 500 ports of VXML 
Server on one server with a 500 port license.

The number of Unified CVP Call Servers required is the larger of:

((Self Service) + (Queue and Collect) + Talking) / 1200 [or 500 for H.323], rounded up,

(Average call arrival rate) / 14 [or 6 for H.323], rounded up, except in the VRU-only model

The co-resident media server can be used for up to 1200 calls [or 500 for H.323], assuming that prompt 
caching is enabled in the VoiceXML gateways. If multiple co-resident servers are to be used, you must 
load-balance across the co-resident media servers in order to spread the load of the calls across all of the 
servers. To reduce the administrative overhead of managing content on multiple media servers, separate 
dedicated media servers can be used.

This means you can run 1200 ports of the Call Server with SIP call control, and 1200 ports of the 
VXML Server, all on one server with 1200 port licenses. An H.323 co-resident server can handle 500 
H.323 calls as well as 500 VXML Server sessions simultaneously, and it can handle a sustained call 
arrival rate of 6 calls per second. This means you can run 500 ports of the Call Server with H.323 call 
control, and 500 ports of the VXML Server, all on one server with 500 licensed ports.

For example, assume that your deployment must be sized for 1200 self-service ports, 500 queue and 
collect ports, and 3700 simultaneous calls to agents.

In the above example definition, self-service means that a call requires SIP or H.323 call control and 
runs an application on the VXML Server. Queue and collect means that a call requires SIP or H.323 call 
control and runs an application using Microapps only on the Call Server.

The following example applies for VXML and HTTP sessions only. The same values apply to both 
co-resident and distributed deployments of Call Servers and VXML Servers.

The number of servers required using SIP call control would be as follows:

((Self Service) + (Queue and Collect) + Talking) / 1200 [or 500 for H.323], rounded up

((1200) + (500) + 3700) / 1200 = 5 servers

If you use the Cisco Unified Border Element as a Session Border Controller (SBC) for flow-through calls 
to handle VXML requirements, then you must use the sizing information presented above. The Cisco 
Unified Border Element is limited to the maximum number of simultaneous VXML sessions or calls as 
outlined above for the particular situation and hardware platform.

If you use the Cisco Unified Border Element as an SBC to handle flow-through calls only (no VXML), 
then take Voice Activity Detection (VAD) into consideration and refer to the sizing information in the 
Cisco Unified Border Element Ordering Guide, available at