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A telephony system includes a packet-based data network that is coupled to various network elements. The network elements include interface devices that are coupled to corresponding stimulus devices. The stimulus devices may include stimulus telephones or a telephone exchange system. Each interface

A telephony system includes a packet-based data network that is coupled to various network elements. The network elements include interface devices that are coupled to corresponding stimulus devices. The stimulus devices may include stimulus telephones or a telephone exchange system. Each interface device receives a stimulus message from a corresponding stimulus device. The stimulus message is encapsulated by the interface device into a packet, such as an Internet Protocol (IP) packet. The packet is communicated across the data network to the target device, which may be another interface device. At the receiving end, the interface device receives the packet, decapsulates the packet to retrieve the stimulus message, and sends the stimulus message to a corresponding stimulus device.

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What is claimed is: 1. Apparatus for use in a telephony system, comprising: a digital interface for connection with a stimulus telephone; a packet interface for communicating with a packet-based network; and a controller to receive stimulus control information according to a stimulus language from

What is claimed is: 1. Apparatus for use in a telephony system, comprising: a digital interface for connection with a stimulus telephone; a packet interface for communicating with a packet-based network; and a controller to receive stimulus control information according to a stimulus language from the digital interface and to encapsulate the stimulus control information into one or more packets for transmission over the packet-based network through the packet interface, wherein the stimulus control information is encapsulated into the one or more packets without providing messaging according to a language different from the stimulus language in the one or more packets. 2. The apparatus of claim 1, wherein the controller encapsulates the stimulus control information into an Internet Protocol packet. 3. The apparatus of claim 1, wherein the digital interface includes a UART interface. 4. The apparatus of claim 1, wherein the digital interface includes a time compression multiplex interface. 5. The apparatus of claim 1, wherein the controller adds a destination address of a telephone switch system into the one or more packets. 6. The apparatus of claim 1, wherein the controller adds a destination address of a second stimulus telephone into the one or more packets. 7. The apparatus of claim 1, wherein the stimulus control information remains in the stimulus language after encapsulation. 8. The apparatus of claim 1, wherein the controller encapsulates the stimulus control information by adding header information according to a network protocol in the one or more packets, the stimulus control information encapsulated in the payload section of the one or more packets without providing messaging of a language different from the stimulus language in the payload section. 9. The apparatus of claim 8, wherein the network protocol header information includes an Internet Protocol header. 10. The apparatus of claim 8, wherein the controller adds further header information according to a transport protocol into the one or more packets. 11. The apparatus of claim 10, wherein the further header information includes a User Datagram Protocol header. 12. The apparatus of claim 1, wherein the controller encrypts the one or more packets. 13. The apparatus of claim 1, further comprising a receiver to receive the one or more packets, the receiver including an element to decapsulate the one or more packets to extract the stimulus control information. 14. The apparatus of claim 13, wherein the receiver is associated with a second stimulus device, and wherein the extracted stimulus control information is in a native stimulus language of the second stimulus device. 15. The apparatus of claim 1, wherein the stimulus control information includes at least one of hook state information and key press event information, the controller to encapsulate the at least one of the hook state information and key press event information into the one or more packets. 16. The apparatus of claim 1, wherein the stimulus control information includes a command selected from the group consisting of a handset volume control command, a handset connect/disconnect command, and a ringer activation command, the controller to encapsulate the command selected from the group consisting of the handset volume control command, the handset connect/disconnect command, and the ringer activation command. 17. The apparatus of claim 1, further comprising an interface card adapted to be inserted into a slot of the stimulus telephone, the interface card comprising the digital interface, the packet interface, and the controller. 18. The apparatus of claim 1, wherein the digital interface is adapted to exchange the stimulus control information with the stimulus telephone. 19. The apparatus of claim 1, wherein the stimulus control information contains a command according to a stimulus protocol selected from the group consisting of off-hook, on-hook, handset volume control, handset connect, and handset disconnect, the controller to encapsulate the command selected from the group consisting of off-hook, on-hook, handset volume control, handset connect, and handset disconnect in the one or more packets. 20. The apparatus of claim 1, further comprising a receiver to receive one or more inbound packets containing inbound stimulus control information, the controller to decapsulate the one or more inbound packets to extract the inbound stimulus control information. 21. The apparatus of claim 1, wherein the digital interface is adapted to communicate with the stimulus telephone through an input/output port of the stimulus telephone. 22. Apparatus for use in a telephony system, comprising: a digital interface for connection with a stimulus telephone; a packet interface for communicating with a packet-based network; and a controller to receive stimulus control information from the digital interface and to encapsulate the stimulus control information into one or more packets for transmission over the packet-based network through the packet interface, wherein the controller also scrambles the stimulus control information before encapsulation. 23. A method for use in a telephony system, comprising: communicating stimulus control information with a stimulus telephone through a first interface connected to the stimulus telephone, and packet information with a packet-based network through a packet interface; encapsulating stimulus control information according to a stimulus language received from the first interface into at least one packet, wherein the stimulus control information is encapsulated into the at least one packet without providing any messaging according to a language different from the stimulus language in the at least one packet; and transmitting the encapsulated stimulus control information in the at least one packet from the packet interface over the packet-based network. 24. The method of claim 23, further comprising: decapsulating one or more packets received from the packet interface and containing stimulus control information; and transmitting the stimulus control information of the decapsulated one or more packets to the first interface. 25. The method of claim 23, wherein encapsulating the stimulus control information includes inserting the stimulus control information in its native stimulus language into a payload of the at least one packet without translating the stimulus control information into a different language and without providing the stimulus control information in messaging according to a language different from the native stimulus language. 26. The method of claim 25, wherein encapsulating the stimulus control information includes adding a network protocol header to the stimulus control information. 27. The method of claim 26, wherein encapsulating the stimulus control information includes adding an Internet Protocol header. 28. The method of claim 27, wherein encapsulating the stimulus control information further includes adding a User Datagram Protocol header. 29. The method of claim 23, further comprising scrambling the stimulus control information before encapsulating. 30. The method of claim 23, further comprising encrypting the at least one packet. 31. The method of claim 23, further comprising providing an interface card to be inserted into a slot of the stimulus telephone, the interface card having the first interface and the packet interface, wherein encapsulating the stimulus control information and transmitting the encapsulated stimulus control information and transmitting the encapsulated stimulus control information is performed by the interface card. 32. The method of claim 23, wherein encapsulating the stimulus control information comprises encapsulating a command according to a stimulus protocol selected from the group consisting of off-hook, on-hook, handset volume control, handset connect, and handset disconnect. 33. The method of claim 23, wherein communicating the stimulus control information comprises communicating the stimulus control information through the first interface and an input/output port of the stimulus telephone. 34. An article including one or more machine-readable storage media containing instructions for call control in a telephony system, the instructions when executed causing a device to: receive stimulus control information according to a stimulus language from a first interface connected to a stimulus telephone; encapsulate the stimulus control information into one or more UDP/IP packets, wherein the stimulus control information is encapsulated into the one or more UDP/IP packets without providing functional messaging according to a language different from the stimulus language in the one or more UDP/IP packets; and communicate the one or more UDP/IP packets to a packet-based data network. 35. The article of claim 34, wherein the one or more storage media contain instructions that when executed causes the device to: receive a packet containing stimulus control information according to the stimulus language; decapsulate the packet to extract the stimulus control information from the received packet; and communicate the extracted stimulus control information to the first interface. 36. The article of claim 34, wherein encapsulating the stimulus control information according to the stimulus language comprises encapsulating one of an off-hook stimulus command, on-hook stimulus command, handset volume control stimulus command, handset connect stimulus command, and handset disconnect stimulus command. 37. The article of claim 34, wherein receiving the stimulus control information according to the stimulus language comprises receiving the stimulus control information according to the stimulus language through the first interface and an input/output port of the stimulus telephone. 38. An article including one or more machine-readable storage media containing instructions for call control in a telephony system, the instructions when executed causing a device to: receive at least one packet containing a stimulus message according to a first language, wherein the received at least one packet does not contain messaging according to another telephony language different from the first language; decapsulate the at least one packet to extract the stimulus message according to the first language; and send the stimulus message according to the first language to a first interface connected to a stimulus telephone. 39. The article of claim 38, further containing instructions that when executed causes the device to: receive a stimulus message according to the first language through the first interface connected to the stimulus telephone; and encapsulate the stimulus message according to the first language into at least one packet. 40. The article of claim 38, wherein receiving the at least one packet containing the stimulus message comprises receiving the at least one packet containing stimulus message containing at least a command selected from the group consisting of off-hook, on-hook, handset volume control, handset connect, and handset disconnect. 41. The article of claim 38, wherein sending the stimulus message comprises sending the stimulus message to the first interface and an input/output port of the stimulus telephone. 42. Apparatus for use in a telephony system, comprising: a digital interface for connection with a stimulus telephone; a packet interface for communicating with a packet-based network; a controller to receive stimulus control information from the digital interface and to encapsulate the stimulus control information into one or more packets for transmission over the packet-based network through the packet interface; and a receiver to receive one or more inbound packets containing inbound stimulus control information, the controller to decapsulate the one or more inbound packets to extract the inbound stimulus control information, wherein each of the one or more inbound packets contains a User Datagram Protocol (UDP) port number, the controller to determine from the UDP port number whether the corresponding inbound packet contains voice data or stimulus control information. 43. A method for use in a telephony system, comprising: communicating stimulus control information with a stimulus telephone through a first interface connected to the stimulus telephone, and packet information with a packet-based network through a packet interface; encapsulating stimulus control information received from the first interface; and transmitting the encapsulated stimulus control information as at least one packet to the packet interface; decapsulating one or more packets received from the packet interface and containing stimulus control information; and transmitting the stimulus control information of the decapsulated one or more packets to the first interface, wherein each of the received one or more packets contains a User Datagram Protocol (UDP) port number, the method further comprising determining from the UDP port number whether the corresponding received packet contains voice data or stimulus control information. 44. An apparatus for use in a telephony system, comprising means for receiving a stimulus message through a first interface connected to a stimulus telephone; means for encapsulating the stimulus message into at least one packet; means for transmitting the at least one packet to a packet-based network; and means for scrambling the stimulus message before encapsulating. 45. The apparatus of claim 44, wherein the stimulus message contains at least a command selected from the group consisting of off-hook, on-hook, handset volume control, handset connect, and handset disconnect, the means for encapsulating to encapsulate the command selected from the group consisting of off-hook, on-hook, handset volume control, handset connect and handset disconnect.