Determining the WAN bandwidth needed for signaling traffic requires network engineering calculations based on the user’s expected call patterns. Signaling bandwidth is impacted by the average frequency of calls, while media bandwidth is also impacted by the average length of calls.
A call between a Centralized SIP user and a local IP Office PSTN trunk in the same branch typically generates about 50 kilo Bytes of signaling traffic on the WAN link between the branch and the Avaya Aura® core. This number must be multiplied by the expected number of calls to calculate the estimated bandwidth required for signaling in kilo bits per second.
Calculation example
If the average number of PSTN calls made or received by all the Centralized SIP users in the branch is 150 calls an hour, then 7,500 kilo Bytes of bandwidth is consumed per hour. On average, if spread evenly, this would mean that signaling for these calls will consume 17 kilo bits per second of the WAN bandwidth.
