Flexible call control framework supporting multi-party service

In order to manage two-party and multi-party multimedia calls, a flexible call control framework is essential. The framework helps to control calls between IP end-points and non-IP devices supporting AM, FM, and GSM waveforms over an IP-based core network. Such a mechanism is more useful in a military environment where third-party control or operator-assisted calls are widely used to bridge the traditional non-IP-based end-devices with multimedia-capable IP-based terminals. This mechanism has been implemented by using a call control framework consisting of standard-based protocols such as SIP, SDP, RTP, and HTTP, entities such as B2BUA for third party call control and MCU or multicast for multi-party conferencing. This paper introduces the framework, discusses some of the functional components and explains the operational aspects of this framework.