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| 7.4 |  | Cisco IP Telephony |
| 7.4.4 |  | Multiple sites with independent call processing |

The independent multiple sites model has the following design characteristics:

- Cisco CallManager or Cisco CallManager cluster at each site to provide scalable call control
- Maximum of 10,000 IP phones per cluster
- No limit to number of clusters
- Use of PSTN for networking multiple sites and for all external calls
- DSP resources for conferencing at each site
- Voice message or unified messaging components at each site
- Voice compression not required