In A2P SMS routing, routes are usually sold as three types: direct (the supplier connects straight to the operator), high quality or premium (one trusted indirect hop, with real DLRs and sender ID kept), and wholesale or low cost (several hops, sometimes grey, with weaker delivery and reporting). Price and reliability go down in that order.
The three main types
| Type | Path to operator | Sender ID | DLR | Typical use |
|---|---|---|---|---|
| Direct | Own A2P agreement with the operator | Delivered as registered | From the operator | OTP, banking, registered brands |
| High quality (premium) | One or two hops through direct partners | Usually kept | Usually real | Transactional and OTP where direct is not available or too expensive |
| Wholesale (low cost, simple) | Several resellers, sometimes grey or SIM based | Often replaced by a numeric ID | Can be generated by a platform | Low value bulk messages, if allowed at all |
Names are not standard. One supplier's "premium" is another's "direct", and some use "gold, silver, bronze". Always ask what the name means in terms of path, sender ID handling and DLR source.
Direct routes
The supplier submits messages to the operator's own A2P platform under a signed agreement. This is the most reliable path and the only one that is fully sanctioned by the operator. It costs more because operators charge official A2P rates, which in many countries are far above person-to-person rates. Details in direct SMS routes explained.
High quality routes
The supplier buys from one or two partners who are direct. Delivery is close to direct, latency is a little higher, and the price is often lower because the partner has volume discounts. The risk is the chain: if the partner changes its own supplier without telling anyone, quality drops. Ask for a list of which networks are reached through which partner and test regularly with real handset tests.
Wholesale and grey routes
Wholesale routes are built for price. Traffic may pass through several resellers and, at the bottom of the market, through unauthorised channels such as SIM farms or person-to-person interconnects. Typical symptoms:
- Alphanumeric sender IDs replaced with random local numbers.
- High delivery rates on paper with complaints from recipients that nothing arrived, often a sign of fake DLRs.
- Sudden drops when the operator's SMS firewall catches the traffic.
Senders on these routes can be exposed to blocking and to complaints. See grey SMS routes: risks for senders.
Other labels you will see
- OTP route: a route reserved for one-time passwords, often with strict content templates and higher priority.
- Promotional or marketing route: accepts advertising content, sometimes only within allowed hours and with opt-out text.
- Transactional route: for alerts, receipts and notifications. The difference is covered in transactional vs promotional SMS.
- Local or international route: in countries like India, traffic from a local registered entity and traffic from abroad can be priced and handled differently.
How to choose
Start from what a failed message costs you. If a missing OTP loses a sign-up, pay for direct or high quality and keep a backup route. For bulk notifications with flexible timing, a tested high quality route is usually the best balance. Avoid routes that cannot tell you how they reach the operator. Price differences between types are explained in how A2P SMS pricing works.
VoIPMatcher sources A2P SMS routes of each type from its carriers and tells you which one you are getting. Request an SMS route with the countries and traffic type you need.
Frequently asked questions
What is SMS routing?
SMS routing is the choice of path a message takes from the sender's platform to the destination mobile operator. For each country and network, a platform picks a supplier, either one connected directly to the operator or one that passes traffic through partners. The route decides delivery speed, sender ID handling, delivery report accuracy and price.
How does SMS routing work?
The sending platform reads the destination number, works out the current mobile network, often with an MNP or HLR lookup, and picks the supplier configured for that network. If the first route fails or is congested, many platforms fall back to a second one. Each supplier may then pass the message on until it reaches the operator.
What is a premium SMS route?
There is no standard definition. Most suppliers use premium or high quality for a route that reaches the operator through one or two trusted partners who are direct, keeps the sender ID and returns real delivery reports. Some use it for direct routes. Ask what the label means in terms of path, sender ID handling and DLR source.
Are wholesale SMS routes legal?
Wholesale is a price tier, not a legal category. A low cost route that buys capacity from authorised partners is legitimate. At the bottom of the market, though, some routes use SIM farms or person to person interconnects that the operator has not authorised. Those grey routes can be blocked at any time and expose senders to complaints.
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