Cisco Cisco Unified IP Interactive Voice Response (IVR) 8.0(1) Release Note
7-10
Cisco Unified Contact Center Express Solution Reference Network Design
Chapter 7 Bandwidth, Security, and QoS Considerations
Estimating Bandwidth Consumption
•
The Team Agent Statistics Report is viewed
•
The Team Skill Statistics Report is viewed
Table 7-8
Bandwidth Requirements For Cisco Supervisor Desktop
Cisco Desktop Administrator Bandwidth Usage
The bandwidth requirements for CDA are very small and are only seen when an administrator is actively
changing configurations. In general, the bandwidth used by CDA is negligible from a provisioning
standpoint.
changing configurations. In general, the bandwidth used by CDA is negligible from a provisioning
standpoint.
Remote Agent Traffic Profile
Cisco Unified CCX signaling represents only a very small portion of control traffic (Cisco Unified CM
CTI and ICD subsystems) in the network. For information on TCP ports and Differentiated Services
Code Point (DSCP) marking for Cisco Unified CCX ICD and CTI traffic, see the sections on
CTI and ICD subsystems) in the network. For information on TCP ports and Differentiated Services
Code Point (DSCP) marking for Cisco Unified CCX ICD and CTI traffic, see the sections on
Bandwidth estimation becomes an issue when voice is included in the calculation. Because WAN links
are usually the lowest-speed circuits in an IP Telephony network, particular attention must be given to
reducing packet loss, delay, and jitter where voice traffic is sent across these links. G.729 is the preferred
codec for use over the WAN because the G.729 method for sampling audio introduces the least latency
(only 30 milliseconds) in addition to any other delays caused by the network.
are usually the lowest-speed circuits in an IP Telephony network, particular attention must be given to
reducing packet loss, delay, and jitter where voice traffic is sent across these links. G.729 is the preferred
codec for use over the WAN because the G.729 method for sampling audio introduces the least latency
(only 30 milliseconds) in addition to any other delays caused by the network.
Where voice is included in bandwidth, system architects should consider the following factors:
•
Total delay budget for latency (taking into account WAN latency, serialization delays for any local
area network traversed, and any forwarding latency present in the network devices). The generally
agreed-upon limit for total (one-way) latency for applications in a network is 150 milliseconds.
area network traversed, and any forwarding latency present in the network devices). The generally
agreed-upon limit for total (one-way) latency for applications in a network is 150 milliseconds.
•
Impact of delays inherent in the applications themselves. 25 seconds is the initial Cisco Unified
CCX agent login setup time with no WAN delay. The overall time to log in agents and base delay
adds approximately 30 seconds of delay per 30 milliseconds of WAN delay.
CCX agent login setup time with no WAN delay. The overall time to log in agents and base delay
adds approximately 30 seconds of delay per 30 milliseconds of WAN delay.
•
Impact of routing protocols. For example, Enhanced Interior Gateway Routing Protocol (EIGRP)
uses quick convergence times and conservative use of bandwidth. EIGRP convergence also has a
negligible impact on call processing and Cisco Unified CCX agent logins.
uses quick convergence times and conservative use of bandwidth. EIGRP convergence also has a
negligible impact on call processing and Cisco Unified CCX agent logins.
Number of agents
Average Download Bandwidth
(Kilobytes/second)
(Kilobytes/second)
Average Upload Bandwidth
(Kilobytes/second)
(Kilobytes/second)
1
0.05
0.05
10
0.05
0.05
50
0.2
0.2
100
0.5
0.5
150
0.7
0.7
200
1.0
1.0
250
1.2
1.2
300
1.4
1.5