Some carriers shun NNIs in favor of new metro-area services.
David Rohde, Network World Big carriers tend to justify the telecommunications merger frenzy by saying users want to get all types of services bundled together into a single package from one player. On this topic Newsletters Enterprise Network Management. White Papers Frame Relay Protocols . One of the earliest frame relay standards,NNI has long been used by local exchange carriers and regional carriers. Those carriers tend to sell frame relay service to users with many locations in a concentrated geographic area.