| Factors of | Disconnections |
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| Number | Message | Factors for Disconnection | Countermeasure (Example) | Location |
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| # 50 | Requested facility | Procedure for a requested facility is | Contact a retailer or a service | LN |
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| not subscribed | not taken. | center. |
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| # 57 | Bearer capability | Unauthorized transmission | Contact a retailer or a service | LN |
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| not authorized | capability was requested. | center. |
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| # 58 | Bearer capability | Transmission capability currently | Contact a retailer or a service | LN |
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| not presently | not available for use. | center. |
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| available |
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| # 63 | Service or option | Report that other services cannot be | Contact a retailer or a service | LN |
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| not available | used. | center. |
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| # 65 | Bearer capability | Requested transmission capability | Contact a retailer or a service |
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| not implemented | is not supported. | center. |
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| # 66 | This service is | Requested channel class is not | Contact a retailer or a service | RU/RN/ |
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| currently not | supported. | center. | LN |
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| available |
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| # 69 | Requested facility | Requested additional service is not | Contact a retailer or a service |
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| not implemented | supported. | center. |
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| # 70 | A connection could | Limited digital transmission | Contact a retailer or a service | LU/LN |
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| not be made | capability among requested | center. |
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| transmission capabilities is |
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| supported. |
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| # 79 | Service or option | Report that a service cannot be | After checking a remote |
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| not implemented | provided. | number, retry. |
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| # 81 | Invalid call | Different dial number from the | After checking a remote | LN |
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| reference value | currently used number is used. | number, retry. |
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| # 82 | Please dial again | Invalid channel number is used. | After checking a remote | LN |
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| number, retry. |
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| # 83 | A connection could | A different number from the interrupt | After checking a remote | LN |
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| not be made | call discriminating number is used. | number, retry. |
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| # 84 | A connection could | The interrupt call discriminating | After checking a remote | LN |
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| not be made | number currently in use is used. | number, retry. |
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| # 85 | A connection could | Call discriminating number is not | After checking a remote | RU |
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| not be made | used. | number, retry. |
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| # 86 | A connection could | Interrupt call has already been | After checking a remote | TN/ LN |
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| not be made | disconnected. | number, retry. |
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| # 88 | Incompatible | Attribute of a terminal unit does not | After checking a remote | LN |
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| destination | match. | number, retry. |
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| # 91 | No available line for | Format of a transit network is not | After checking a remote |
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| use | normal. | number, retry. |
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| # 95 | A connection could | Report of other invalid messages. |
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| not be made |
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| # 96 | Mandatory | Required information element is in | Contact a retailer or a service | LU/ LN |
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| information element | short. | center. |
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| is missing |
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| # 97 | A connection could | Undefined or | Contact a retailer or a service | LU/ LN |
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| not be made | is received. | center. |
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| # 98 | A connection could | Message mismatch. | Contact a retailer or a service | LU/ LN |
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| not be made |
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| # 99 | A connection could | Information element is undefined. | Contact a retailer or a service | LU/ LN |
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| not be made |
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| # 100 | Invalid information | The contents of information element | Contact a retailer or a service | LU/LN |
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| element contents | is invalid. | center. |
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| # 101 | Message not | Received message and a call status | After checking a remote | LU/LN |
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| compatible with call | mismatch. | number, retry. |
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| state |
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| # 102 | Recovery on timer | Restoration due to an expiration of | After checking a remote | LU/LN |
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| expiry | timer. | number, retry. |
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