A predictive dialler SIP trunk for controlled pacing.

Dial ratio describes how aggressively a platform attempts contacts relative to expected available agents. It does not directly define carrier capacity. Contactability, call duration, ringing time and campaign logic change the actual number of concurrent connections.

Sizing therefore uses real or realistically estimated peak values. A bounded traffic pilot provides better evidence than a generic assumption based on seats and dial ratio.

Calls per second measure the rate of new call attempts. High CPS loads signalling, dialler, SBC and carrier endpoints even where many destinations are busy or unreachable. The value is therefore agreed explicitly and limited in campaign pacing.

Short bursts can matter as much as the hourly average. With multiple campaigns or servers, combined peak load must be considered rather than only the limit of one campaign.

Concurrency includes more than conversations connected to agents. Ringing, setting-up and early-media calls can also consume resources. Long ring times and many unanswered destinations therefore increase required concurrency.

The platform should control pacing, timeout and cancellation so the approved profile is respected. The carrier does not replace sound campaign configuration.

Predictive diallers react to technical and network results. Busy, unreachable, rejected and no answer should remain distinguishable. Early media can introduce additional audio states before a call is finally connected.

Acceptance testing covers typical response codes and real destination networks. One successful test call does not show how the platform handles failures and high attempt rates.

Campaigns can use different authorised caller IDs. Selection, format, From and P-Asserted-Identity are agreed. Arbitrary or unverified caller IDs are not part of the service.

If a callback should reach the correct campaign, the displayed number needs a defined inbound path. This is tested separately and cannot be inferred from a successful outbound call.

The service starts with bounded destinations and a defined load window. Call setup, audio, outcome distribution and technical metrics are reviewed together. Pacing can then be increased in a controlled manner toward the agreed profile.

If campaign type, destination countries or peak load changes materially, the profile should be reviewed again. This keeps the predictive dialler SIP trunk a controlled part of operations rather than an unclear bottleneck.