Cisco.IP.Telephony.Planning.Design.Implementation.Operation.and.Optimization [Electronic resources]

Tebyan

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Trunk Sizing

The information that you collect in Table C-3 sizes the trunks required from each site and designs the call admission control (CAC) for voice calls.

Table C-3. Trunk Sizing

Site Name

On-Net Minutes per Month

Off-Net Minutes per Month

Number of Users

Total Minutes

Trunk Size Required[1]

[1] The trunk size required is derived from the rest of the data.

Notes/Comments

The information that you collect in Table C-3 is helpful in sizing the PSTN trunks.

Note

On-Net refers to calls that originate from and terminate on an IP endpoint. An On-Net call never requires a connection to a PSTN and uses only IP for the entire duration. Off-Net refers to a call that requires the connection to a PSTN network to complete the call.