Voice relaying apparatus and voice relaying method

Abstract

A voice relaying apparatus includes a receiving section for receiving a cell from an asynchronous transfer mode (ATM) network, a plurality of cell assembling/disassembling units for assembling and disassembling the cells, and a transmitting section for transmitting the cells assembled by each of the plurality of cell assembling/disassembling units. Each of the plurality of cell assembling/disassembling units is composed of a cell disassembling section for disassembling the cell received by the receiving section, a detecting section for detecting whether or not the voice relaying apparatus is carrying out a relay switch operation, and a cell assembling section for assembling the cell disassembled by the cell disassembling section and then sending to the transmitting section, if the fact that the voice relaying apparatus is carrying out the relay switch operation is detected by the detecting section.

1 - 21 . (canceled) 
     
     
         22 . A method comprising:
 determining, by a device, that a synchronous signal is not detected;   selecting, by the device, a voice signal based on determining that the synchronous signal is not detected;   assembling, by the device, a voice cell based on the voice signal; and   sending, by the device, the voice cell.   
     
     
         23 . The method of  claim 22 , where determining that the synchronous signal is not detected comprises:
 generating a detection signal based on another voice signal, and   determining that the synchronous signal is not detected based on the detection signal.   
     
     
         24 . The method of  claim 23 , where the other voice signal includes a pulse code modulation (PCM) voice signal. 
     
     
         25 . The method of  claim 22 , further comprising:
 converting a pulse code modulation (PCM) voice signal into the voice signal before determining that the synchronous signal is not detected.   
     
     
         26 . The method of  claim 22 , where the voice signal is a low-bit-rate coding voice signal. 
     
     
         27 . The method of  claim 22 , further comprising:
 generating an address indication signal that indicates an address of a transmission destination for the voice cell; and   sending the address indication signal to an assembling section of the device that assembles the voice cell.   
     
     
         28 . The method of  claim 27 , where generating the address indication signal includes:
 generating a detection signal based on determining that the synchronous signal is not detected, and   generating the address indication signal in accordance with the detection signal.   
     
     
         29 . The method of  claim 22 , where selecting the voice signal includes:
 determining that a relay switch operation is not being carried out based on the synchronous signal not being detected; and   selecting the voice signal based on the relay switch operation not being carried out.   
     
     
         30 . A method comprising:
 determining, by a device, that a synchronous signal is present in a particular signal;   assembling, by the device, a cell based on a voice signal after determining that the synchronous signal is present in the particular signal; and   transmitting, by the device, the cell.   
     
     
         31 . The method of  claim 30 , where assembling the cell comprises:
 determining that a relay switch operation is being carried out based on the synchronous signal being present in the particular signal; and   assembling the cell based on the voice signal based on the relay switch operation being carried out.   
     
     
         32 . The method of  claim 30 , further comprising:
 receiving another cell that is different from the cell; and   generating the voice signal based on information extracted from the other cell.   
     
     
         33 . The method of  claim 30 , further comprising:
 generating a pulse code modulation (PCM) voice signal, and   generating the voice signal by combining the PCM voice signal and the synchronous signal.   
     
     
         34 . The method of  claim 30 , further comprising:
 generating the particular signal based on another voice signal.   
     
     
         35 . The method of  claim 30 , further comprising:
 selecting an address based on information included in the synchronous signal after determining that the synchronous signal is present in the particular signal; and   transmitting at least a portion of the particular signal based on the address.   
     
     
         36 . A system comprising:
 a network device to:
 determine whether a synchronous signal is detected based on a detection signal; 
 select, when the synchronous signal is detected, a first voice signal based on the synchronous signal being detected; 
 select, when the synchronous signal is not detected, a second voice signal based on the synchronous signal not being detected 
 assemble a voice cell based on the first voice signal or the second voice signal; and 
 transmit the voice cell. 
   
     
     
         37 . The system of  claim 36 , where, when selecting the second voice signal, the network device is to:
 determine that a relay switch operation is not being carried out based on the synchronous signal not being detected, and   select the second voice signal based on determining that the relay switch operation is not being carried out.   
     
     
         38 . The system of  claim 36 , where the network device is further to:
 generate an address indication signal; and   set an address of a transmission destination for the voice cell based on the address indication signal.   
     
     
         39 . The system of  claim 38 , where, when generating the address indication signal, the network device is to:
 generate the detection signal based on determining that the synchronous signal is not detected, and   generate the address indication signal in accordance with the detection signal.   
     
     
         40 . The system of  claim 38 , where the network device is to:
 convert a pulse code modulation (PCM) voice signal into the second voice signal before determining whether the synchronous signal is not detected.   
     
     
         41 . The system of  claim 36 , where the second voice signal is a low-bit-rate coding voice signal.