A method for checking the error of a message for call and access control in a broadband integrated information network

摘要

The present invention relates to a method for checking an error of a message for call and connection control in a B-ISDN, comprising the steps of: (S1) storing the received release completion message in the secured memory area after initialization; Detecting a bit value corresponding to a protocol distinguisher and confirming an error (S2); Detecting a length bit of the call reference value to identify an error (S3); Detecting a flag bit to identify an error (S4); Detecting a call reference value (S5); Detecting a message type bit and determining that an error has occurred (S6) if the bit value does not correspond to a release completion message; Detecting a message length bit (S7); If the received message corresponds to a first call release message, determining whether a cause information element exists and checking for an error (S8); A step (S9) of determining length information by using the sum of the number of information elements and the length of each information element, determining whether the message length corresponds to the length information, and checking the error; And a step S10 of outputting the final number of errors for the cancel completion message confirmed in the steps S1 to S9. According to the present invention, according to the specification of Q.2931 protocol in the ATM user network interface By confirming the error of the received message, it is possible to smoothly control the call and connection in the B-ISDN.