1. A computer-implemented method, comprising: deploying, by a Session Initiation Protocol (SIP) Servlets application server, a JRuby application to provide Voice over Internet Protocol (VoIP) services; and associating, by the SIP Servlets application server, a deployment file in a Ruby adaptation layer of a JAVA EE application server with the JRuby application, the deployment file defining a Session Initiation Protocol (SIP) Servlets application name in a SIP configuration section of the deployment file and a name of a class that handles SIP message.