Cisco Cisco Unified Contact Center Enterprise 9.0(2) Leaflet

Unified CM 6.1 and later releases 

Intra-Cluster Communications Signaling (ICCS)

Total Bandwidth (Mbps) = ((Total BHCA) / 10,000)

 [2.25 + (0.006  Delay)], 

where Delay = Round-trip-time delay in msec

This is the bandwidth required between each Unified CM subscriber that is connected to voice 
gateways, agent phones, and Agent PGs.

Database and other communications

1.544 Mbps for each subscriber remote from the publisher

The BHCA value to use for the ICCS formulae above is the total BHCA for all calls coming into the 
contact center.

These bandwidth requirements assume proper design and deployment based on the recommendations 
contained throughout this document. Inefficient design (for example, if ingress calls to Site 1 are treated 
in Site 2) will cause additional intra-cluster communications, possibly exceeding the defined bandwidth 
requirements. 

This section provides some basic guidelines for provisioning bandwidth for the connection between the 
gateway PG and the system PG.

No special considerations are necessary for the PG-to-CC connection over other TDM PGs.

If agent reporting is not used, then the Enable Agent Reporting checkbox in the Agent distribution tab 
of the PG explorer should be unchecked to avoid sending unnecessary data over the link. For more 
information, see 

.