Abstract: A SMS/MMS Proxy maintains SIP user identities in an IMS network on behalf of SMS capable mobile terminals to give legacy mobile terminals a presence in the IMS network. The SMS/MMS Proxy includes an application server to translate text messages received from a mobile terminal via a gateway into SIP transactions and uses the SIP user identities allocated to said mobile terminals to conduct SIP transactions on their behalf.

Abstract: A SIP client for a communication device includes a user agent to communicate with a user application in the communication device. The user agent provides a high-level application interface to the user application and translates user commands into corresponding signaling and media operations. The same user agent may be shared by a plurality of user applications. A signaling agent controlled by the user agent performs signaling operations necessary to establish and maintain communication sessions. To avoid signaling overhead on a high cost network, the SIP client can be located in a remote network so signaling messages do not need to traverse the high cost network.

Abstract: A media client for a networked communication device includes a user agent to communicate with a multimedia application in the networked communication device. The user agent provides a high-level application interface to the multimedia application. A signaling agent under the control of the user agent performs signaling operations necessary to establish and maintain communication sessions. A media agent under the control of the user agent performs media operations. The media client may be located in a network and remotely accessed by the multimedia application. The user agent, signaling agent and media agent have network interfaces that allow these elements to be distributed within the network and accessed remotely.

Abstract: A media client for a networked communication device includes a user agent to communicate with a multimedia application in the networked communication device. The user agent provides a high-level application interface to the multimedia application. A signaling agent under the control of the user agent performs signaling operations necessary to establish and maintain communication sessions. A media agent under the control of the user agent performs media operations. The media client may be located in a network and remotely accessed by the multimedia application. The user agent, signaling agent and media agent have network interfaces that allow these elements to be distributed within the network and accessed remotely.