Packages 
Package Description
com.nexmo.client
The root of the Nexmo client library, containing NexmoClient class, which is probably what you want.
com.nexmo.client.account  
com.nexmo.client.applications  
com.nexmo.client.auth
Provides support for the various authentication methods supported by different Nexmo APIs.
com.nexmo.client.conversion  
com.nexmo.client.incoming  
com.nexmo.client.insight  
com.nexmo.client.legacyutils  
com.nexmo.client.numbers  
com.nexmo.client.redact  
com.nexmo.client.sms  
com.nexmo.client.sms.callback  
com.nexmo.client.sms.callback.messages  
com.nexmo.client.sms.messages  
com.nexmo.client.sns  
com.nexmo.client.sns.request  
com.nexmo.client.sns.response  
com.nexmo.client.verify  
com.nexmo.client.voice
Provides access to the Nexmo Voice API.
com.nexmo.client.voice.ncco
Provides useful NCCO classes which can be serialized using Jackson when implementing webhooks to drive the Nexmo Voice API.
com.nexmo.client.voice.servlet
Provides an abstract Servlet for building NCCO webhooks for the Nexmo Voice API.