A communication device capable of participating in a conversation over a network. The communication device includes an encoder to receive and encode media locally created using the communication device and associated with the conversation and a transmitter to transmit over the network the locally created media to one or more participants of the conversation. The communication device also includes a receiver to receive media from the one or more participants of the conversation over the network and a time-shifting buffer to store in a time-based format both the media received over the communication network and the locally created media. The time-shifting buffer enables the communication device to either (i) render the media received over the network in a near real-time mode or (ii) render both the media received over the network and the locally created media in a time-shifted mode by retrieving the stored media from the time-shifting buffer. A conversation management system enables the communication device to transition rendering of the media of the conversation between the time-shifted mode and the near real-time mode without interrupting the ongoing storage of the media of the conversation received at the communication device over the network into the time-shifting buffer. By associating the locally created media and the media received over the network, the conversation is constituted.