The most simple one is that one end customer accesses the APIs of just one telco operator (single-operator relationship).
Distribution Options
CAMARA APIs allow different Distribution Options
Blue lines = CAMARA APIs, red lines = Operate APIs. SEP = Service Exposure Platform.
It is also possible that additional portals or gateways are in between.
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Big customers also have the ability to handle multi-operator relationships.
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Smaller customers can therefore use the services of an aggregator. The aggregator can enable e.g. a single-sign-on for the end customer and handle the authentication and authorization towards the telco operators, as well as the routing to the correct telco operator.
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As alternative solution also a single operator “API roaming” is possible. In this case one operator is considered as aggregator of another operator. So the same APIs can be used for east-/westbound as for northbound.