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One of key factors of Next Generation Network Parlay Group leads the standard-so called Parlay/OSA API to (NGN) is opening up the capabilities of the network. Parlay open up the networks by defining, establishing, and supporting Group leads the standard, so called Parlay/OSA API, to open up a common industry-standard APIs. The Paraly/OSA APIs are the networks by defining, establishing, and supporting a common standardized by 3GPP and ETSI.industry-standard APIs. Parlay Group also specifies the Parlay Even though Parlay/OSA API is aimed for the third party Web Services API, also known as Parlay X API, which is much simpler than Parlay/OSA API to enable IT developers to use it applictneelope it l the networ k eeris without network expertise. One of Parlay X API is Third PartyThere is need to simplify the APIs for the purpose of being Call (TPC) API which provides simple API for the purpose of able to use APIs much easier way in order to develop the creating and managing the call by the third party.services without network expertise. That causes giving birth to IMS was devised originally by 3GPP for mobile networks, but the Paraly Web Service APIs named Parlay X APIs. currently it is accepted widely as a reference model of NGN even Anyhow, as a result of attempting to open up the networks, in fixed network domains. IMS has interface called ISC to open IMS by architecture[3] encompasses the way that third party the network capabilities. application can create and manage the services from outside This paper overviews how Parlay X Web Services can be the operator network domain. supported in IMS in a architectural perspective, and discusses This paper outlines how Parlay Web Service Gateway can be how the third party call can be implemented in IMS using Parlay connected to IMS in a view of architecture and briefly X TPC APIs.introduces Parlay X TPC APIs. The paper then shows how the third party call control utilizing parlay X Third Party Call (TPC) API can be implemented in IMS.