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A method and related apparatus for delivering a message from a calling party at a calling station to a called party at a called station, the method including: in response to an unsuccessful attempt to communicate from the calling station to the called station, storing a message from the calling stat

A method and related apparatus for delivering a message from a calling party at a calling station to a called party at a called station, the method including: in response to an unsuccessful attempt to communicate from the calling station to the called station, storing a message from the calling station, using a messaging system, for later delivery to the called station; obtaining address information, using the messaging system, for the calling party and for the called station, from the calling station; attempting to deliver the message, using the messaging system, to the called station by initiating a communication from the messaging system to the called station using the address information for the called station that was obtained from the calling station; determining, using the messaging system, whether the message delivery attempt was successful; and, in response to successful delivery of the message, attempting to notify the calling party that the message to the called station was successfully delivered.

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A method and related apparatus for delivering a message from a calling party at a calling station to a called party at a called station, the method including: in response to an unsuccessful attempt to communicate from the calling station to the called station, storing a message from the calling stat

A method and related apparatus for delivering a message from a calling party at a calling station to a called party at a called station, the method including: in response to an unsuccessful attempt to communicate from the calling station to the called station, storing a message from the calling station, using a messaging system, for later delivery to the called station; obtaining address information, using the messaging system, for the calling party and for the called station, from the calling station; attempting to deliver the message, using the messaging system, to the called station by initiating a communication from the messaging system to the called station using the address information for the called station that was obtained from the calling station; determining, using the messaging system, whether the message delivery attempt was successful; and, in response to successful delivery of the message, attempting to notify the calling party that the message to the called station was successfully delivered. ires as well as a pair of test wires to a pair of subscriber terminals. The test wires lead to a test circuit on the provider side of the housing of the NID. The subscriber terminals are located on the subscriber side of the housing to interconnect the provider wires with a pair of subscriber wires. A jack in the NID has a normal mode of operation in which the provider wires are electrically connected to the subscriber wires and a test mode of operation in which the provider wires are disconnected from the subscriber wires. A pair of lead wires are electrically connected to the jack and have free ends that connect to the subscriber terminals. This connects the test circuit in parallel physically and electrically between the provider wires and the subscriber wires. The free ends are readily disconnected from the subscriber terminals to disconnect the test circuit. elator means share a surface acoustic wave (SAW) correlator adapted to be used half duplex for transmission and receiving. 14. The modem according to claim 1, wherein: said resonator means comprises a surface acoustic wave (SAW) resonator; said spreading means and said correlator means share a surface acoustic wave (SAW) correlator adapted to be used half duplex for transmission and receiving; and wherein said SAW resonator and said SAW correlator are constructed on the same monolithic substrate. 15. The modem according to claim 1, wherein said detection means comprises: a slow peak detector adapted to generate a slowly varying reference signal; and a fast peak detector adapted to track the envelope of said correlator signal and to generate said detection signal therefrom. 16. The modem according to claim 1, wherein said decision means is adapted to generate a binary output signal in accordance with said detection signal applied against said threshold. 17. The modem according to claim 16, wherein said detection means is adapted to generate said threshold dynamically in accordance with said correlator signal. 18. A method of modulating and demodulating a direct sequence spread spectrum signal, said method comprising the steps of: generating an oscillator signal utilizing a resonator wherein the frequency of oscillation is determined by the center frequency of said resonator; gating said oscillator signal in accordance with input data to be transmitted so as to generate a series of pulses; spreading said pulses utilizing a spreading code sequence waveform so as to generate a spread spectrum transmission signal; transmitting said spread spectrum transmission signal; receiving said spread spectrum transmission signal; de-spreading said spread spectrum transmission signal in accordance with said code sequence so as to generate a correlator signal; detecting an envelope of said correlator signal so as to generate a detection signal; and applying a threshold to said detection signal so as to generate an output data signal therefrom. 19. A direct sequence spread spectrum radio frequency (RF) modem, comprising: an oscillator having a resonator and adapted to generate an oscillator signal, the center frequency of said oscillator determined by the center frequency of said resonator; a plurality of N transmit/receive circuits, each said transmit/receive circuit comprising: switching means for gating said oscillator signal in accordance with input data to be transmitted so as to generate a series of pulses; spreading means for spreading the pulses output of said switching means with a spreading code sequence waveform so as to generate a spread spectrum transmission signal; correlator means adapted to de-spread a spread spectrum receive signal in accordance with said code sequence so as to generate a correlator signal; detection means for detecting an envelope of said correlator signal so as to generate a detection signal; and decision means for applying a threshold to said detection signal so as to generate an output data signal therefrom; wherein the correlator in each transmit/receive circuit is configured with a unique function substantially orthogonal to functions in other correlators; means for combining and transmitting the N spread spectrum transmission signals generated by said N transmit/receive circuits as a combined spread spectrum transmission signal; means for receiving and splitting said combined spread spectrum transmission signal into N spread spectrum receive signals; and wherein N is a positive integer. 20. The modem according to claim 19, wherein said resonator comprises a surface acoustic wave (SAW) resonator. 21. The modem according to claim 19, wherein said switching means comprises a plurality of switches coupled in series and operative to provide a high level of electrical isolation. 22. The modem according to claim 21, wherein said plurality of switches comprises a pluralit y of Field Effect Transistor (FET) switches. 23. The modem according to claim 19, wherein said spreading means comprises a surface acoustic wave (SAW) matched filter/correlator. 24. The modem according to claim 19, wherein said spreading code sequence comprises a Barker code series sequence. 25. The modem according to claim 19, wherein said spreading code sequence comprises a linear FM code. 26. The modem according to claim 19, wherein said means for transmitting comprises: an output amplifier for amplifying said combined spread spectrum transmission signal; and an antenna coupled to the output of said output amplifier. 27. The modem according to claim 19, wherein said means for receiving comprises: an antenna adapted to receive said spread spectrum transmission signal; a band pass filter coupled to said antenna; and a low noise amplifier coupled to the output of said band pass filter. 28. The modem according to claim 19, wherein said correlator means comprises a surface acoustic wave (SAW) matched filter/correlator. 29. The modem according to claim 28, wherein said SAW matched filter/correlator is configured with a Barker code series sequence. 30. The modem according to claim 19, wherein said spreading means and said correlator means in each transmit/receive circuit share a surface acoustic wave (SAW) correlator adapted to be used half duplex for transmission and receiving. 31. The modem according to claim 19, wherein: said resonator means comprises a surface acoustic wave (SAW) resonator; each said spreading means and each said N correlator means share a surface acoustic wave (SAW) correlator adapted to be used half duplex for transmission and receiving; and wherein said SAW resonator and said N SAW correlators are constructed on the same monolithic substrate. 32. The modem according to claim 19, wherein said detection means comprises: a slow peak detector adapted to generate a slowly varying reference signal; and a fast peak detector adapted to track the envelope of said correlator signal and to generate said detection signal therefrom. 33. The modem according to claim 19, wherein said decision means is adapted to generate a binary output signal in accordance with said detection signal applied against said threshold. 34. The modem according to claim 33, wherein said detection means is adapted to generate said threshold dynamically in accordance with said correlator signal. 35. The modem according to claim 19, wherein said means for combining the N spread spectrum transmission signals comprises an RF power combiner splitter. 36. The modem according to claim 19, wherein said means for splitting said combined spread spectrum signal comprises an RF power combiner splitter. 37. A method of modulating and demodulating N direct sequence spread spectrum signals, each direct sequence spread spectrum signal associated with one of N channels, said method comprising the steps of: generating N oscillator signals utilizing a resonator wherein the frequency of oscillation is determined by the center frequency of said resonator; for each channel: gating each oscillator signal in accordance with input data for the Nthchannel to be transmitted so as to generate a series of pulses; spreading said pulses utilizing a spreading code sequence waveform so as to generate a spread spectrum transmission signal, said spreading code sequence waveform for the Nthchannel substantially orthogonal with the spreading code sequence waveforms of all other channels; de-spreading a spread spectrum transmission receive signal in accordance with said code sequence so as to generate a correlator signal; detecting an envelope of said correlator signal so as to generate a detection signal; applying a threshold to said detection signal so as to generate an output data signal for the Nthchannel therefrom; combining and transmitting the N spread spectrum transmission signals as a combined spread spec