Disclosed is a communication server that uses a communication mediator to conduct voice/text communication sessions between users with different communications systems through a session initiation protocol (SIP) server. The communication server uses a voice recognition system to interface with participants in communications sessions and to provide a link between the participants and the mediator. The voice recognition system monitors ongoing voice communications for keywords and verbally prompts the participants to provide additional value to the communication session. The mediator can also access and retrieve information directly from a directory or from other data sources through an intelligent data server. Based on the directory information, additional participants can be added to the communication session. The mediator can also establish a connection between the data server, the voice recognition server, and the SIP server so that data requested by participants during a session may be retrieved from the data sources.