Reference definitions written from operations, not marketing: the metrics, frauds and commercial concepts that wholesale voice and messaging actually run on. Each entry is self-contained and links to the services and observatories where the concept earns its keep.
The percentage of call attempts that get answered. The first health metric of any voice route.
How long answered calls last. Human conversation clusters; bypass traffic does not.
The wait before ringback. Long or erratic PDD exposes hidden hops.
Did the call reach the destination at all, answered or not. Settlement disputes live here.
A2P messages riding P2P-priced channels. The quiet tax on messaging revenue.
Racks of local SIMs re-originating international calls as cheap local ones.
The calling party number. Under origin-based rating, it decides the price, so it gets attacked.
Termination priced by presented origin. The rule that created the refiling industry.
The presented calling number. Honest CLI labelling is the difference between products and fraud.
A number moved to a new SIM. Legitimate for subscribers, devastating when fraudsters request it.
Cryptographic attestation of call origin. Regulatory in North America, a trust signal everywhere.
The agreement that lets two networks exchange traffic directly. A wholesale carrier’s core asset.
One ring and cut. The callback fraud that bills premium rates to whoever dials back.
Artificially inflated traffic: bots trigger OTP messages that someone gets paid to terminate.
Verification by missed call: the OTP alternative that rings once and costs less.
The filter layer that classifies, prices and blocks messaging traffic per rule and per sender.
Routes where the calling number survives the chain intact, verified end to end.
Machine-to-person vs person-to-person traffic. The price gap that powers an entire fraud economy.
The protocol that carries the world’s A2P messaging between apps and carriers.
One connection, many destinations: the wholesale model of messaging exchange.
Route each call down the cheapest acceptable path. The oldest optimization in wholesale.
The aggregator layer: MVNOs without their own host agreements.
