ISDN Information
ISDN Switches
Depending on the type of ISDN lines you are using, your service provider may assign zero, one, or two SPIDs per line.
Switch Type | SPIDs Allocated | |
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AT&T 5ESS Custom | None | |
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AT&T 5ESS | 1 per | |
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NT | 1 per | |
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1 per device | ||
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Siemens EWSD | 1 per | |
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Siemens EWSD | 1 per device | |
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International (outside United States or | None | |
Canada) | ||
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ISDN Errors
The following table describes ISDN standard cause values that are sent from the ISDN switch to the router to indicate ISDN call status. Although the cause values are standardized, each ISDN service provider phrases the cause differently. Therefore, the causes shown in the table might not be the exact messages that appear on your television monitor.
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| ISDN Errors | |
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Code | Cause | Definition | |
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1 | Unassigned number | The switch received the sent ISDN number in the correct format; | |
however, no destination equipment uses the number. | |||
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2 | No route to specified | The ISDN exchange can not recognize the intermediate network | |
transit network | through which to route the call. | ||
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3 | No route to destination | The destination address is not serviced by the intermediate network | |
through which the call is routed. | |||
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6 | Channel unacceptable | The specified channel does not provide sufficient service quality to | |
accept the requested connection. | |||
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7 | Call awarded and | The user is assigned an incoming call that is being connected to an | |
delivered | |||
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16 | Normal call clearing | Normal call clearing has occurred. | |
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17 | User busy | All B channels are in use; the called system acknowledges the | |
connection request, but is unable to accept the call. | |||
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18 | No user responding | The destination does not respond to the call so the connection | |
cannot be completed. | |||
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ViewStation User’s Guide | 131 |
