Wholesale VoIPAlso known as Wholesale voice, Carrier services

How the wholesale voice market works

A retail provider, such as a calling app or SIP trunk reseller, sends international calls to one or more wholesale carriers. Each carrier publishes a rate deck: prices per destination prefix, often in fractions of a cent per minute, with billing increments such as 1/1 or 60/60. The carrier then hands the call to another carrier or to the destination network’s interconnect, where it pays a termination rate.

• Routes are graded by quality, from premium “CLI” routes with full caller ID to lower-cost routes.
• Quality metrics: ASR, ACD, PDD and caller-ID delivery.
• Switching: a Class 4 softswitch performs least-cost routing across vendors.
• Settlement: CDRs from both sides are reconciled before invoices are paid.

Licensing and legitimacy

Legitimate wholesale traffic reaches its destination through licensed carriers and formal interconnect agreements, and the destination network is paid its termination rate. Routes that deliver international calls as if they were local, typically by passing them through SIM cards in a SIM box, bypass those agreements. This is illegal in most countries and damages quality through lost caller ID and poor audio. Regulators and operators actively detect it.

Read wholesale VoIP and call termination explained for a fuller overview.

Where GSMCalls fits

GSMCalls is a gateway management platform for authorised deployments, such as enterprise mobile access, backup lines and carrier-approved services. It is not a termination route and must not be used for interconnect bypass; see the acceptable-use policy. For wholesale traffic, use licensed carriers and call termination agreements.