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This paper reports the implementation of the voice recognition system for the private phonebook service on the telephony network. The system used an intelligent network (IN)  to provide the entry functionalities; call control, charging, subscriber data enquiry, play voice prompt and record voice file. The voice recognition core is iSpeech  developed by National Electronics and Computer Technology Center (NECTEC). The integration solution: new call flow and service logic in service control point (SCP) and HTTP client are implemented.