A-Z termination in wholesale VoIP means providing voice call termination to a very wide range of countries and destinations worldwide through one carrier/provider.

The term “A-Z” basically means “from almost any origin to almost any destination.”

Simple example

Suppose a VoIP provider has customers making calls to:

• 🇺🇸 USA
• 🇬🇧 UK
• 🇮🇳 India
• 🇦🇺 Australia
• 🇿🇦 South Africa
• 🇳🇬 Nigeria
• 🇧🇷 Brazil
• 🇦🇪 UAE
• 🇸🇬 Singapore
• 🇵🇭 Philippines

Instead of that customer establishing a separate carrier relationship for every country, an A-Z termination provider can provide routes for many/all of these destinations through a single wholesale relationship.

Customer → Your SIP connection → Your A-Z network/carriers → Destination operator → End user

Why is it called “A-Z”?

Think of the telecom rate sheet as an A-to-Z destination list.

For example:

The exact rates depend on the route, destination, CLI requirements, traffic type, volume, and carrier.

A-Z vs. single-country termination

Single-country termination:

“We specialize in India termination.”

You provide routes primarily to India.

A-Z termination:

“We provide termination to 200+ countries.”

You provide a broader portfolio of destinations through multiple carrier/interconnect relationships.

A-Z does NOT necessarily mean one physical network

This is important in wholesale VoIP.

An A-Z provider may use multiple upstream carriers, direct interconnections, regional carriers, and transit partners to cover different destinations.

For example:

PW Carrier → Carrier A → India

PW Carrier → Carrier B → UAE

PW Carrier → Carrier C → Brazil

PW Carrier → Direct Interconnect → USA

The customer sees one wholesale provider/SIP connection, while the provider manages the underlying routing.

What customers usually expect from A-Z termination

When a customer asks for A-Z termination, they normally want more than just a country list:

• Competitive $/minute rates
• Stable routes
• Good ASR
• Good ACD
• Low PDD
• CLI support where required
• High CPS/concurrent-call capacity
• 24/7 NOC/technical support
• Multiple routing options
• Fraud monitoring
• Ability to handle high-volume traffic