![](/images/new-backgrounds/1110102/11010289x1.webp)
Chapter 4 - V.22bis Commands
V.22bis Result Codes
The modem responds to commands from the DTE and to activity on the line by signaling to the DTE in the form of result codes. .
Two forms of each result code are available:
Table of Result Code Definitions
Code | Message | Meaning |
0 | OK | A command line has been executed. |
1 | CONNECT | For X command values specifying no speed reporting, the modem has connected |
|
| to the line and either the line speed is 300 bps and line speed is enabled, or the |
|
| DTE speed is 300 bps and DTE speed reporting is enabled. |
2 | RING | An incoming ring signal is detected on the line. What qualifies as a ring signal is |
|
| determined by |
3 | NO CARRIER | Sent when attempting to establish a call if: |
|
| 1. Ringback is detected and later ceases but no carrier is detected within the |
|
| period of time determined by register S7, or |
|
| 2. No ringback is detected within the period of time determined by register S7. |
|
| Also sent when the modem |
|
| For X0, sent for the following conditions: |
|
| 1. If busy tone detection is enforced, busy or circuit busy has been detected. |
|
| 2. If dial tone detection is enforced or selected, dial tone has not been detected. |
4 | ERROR | Sent during an attempt to execute a command line if any of the following conditions |
|
| occur: |
|
| 1. The command line contains a syntax error. |
|
| 2. The modem cannot execute a command contained in the command line, i.e., |
|
| the command does not exist or is not supported. |
|
| 3. A command parameter within the command line is outside the permitted range. |
|
| For X0, X1, X2, and X3, this message is sent instead of DELAYED and |
|
| BLACKLISTED. |
5 | CONNECT 1200 | The modem has connected to the line and either the line speed is 1200 bps and |
|
| DCE speed reporting is enabled, or the DTE speed is 1200 bps and DTE speed |
|
| reporting is enabled. |
6 | NO DIAL TONE | For X2 and X4, the modem has been instructed to wait for dial tone during dialing |
|
| but none is received. |
7 | BUSY | For X3 and X4, if busy tone detection is enforced, the busy (engaged) signal is |
|
| detected on the line when the modem is attempting to originate a call. |
8 | NO ANSWER | The modem is attempting to originate a call if a continuous ringback signal is |
|
| detected on the line until the expiration of the timer S7. |
9 | CONNECT 600 | The modem has connected to the line, the DTE speed is 600 bps, and DTE speed |
|
| reporting is enabled. |
10 | CONNECT 2400 | The modem has connected to the line and either the line speed is 2400 bps and |
|
| DCE speed reporting is enabled, or the DTE speed is 2400 bps and DTE speed |
|
| reporting is enabled. |
11 | CONNECT 4800 | The modem has connected to the line, the DTE speed is 4800 bps and DTE speed |
|
| reporting is enabled. |
12 | CONNECT 9600 | The modem has connected to the line, the DTE speed is 9600 bps and DTE speed |
|
| reporting is enabled. |
13 | CONNECT 7200 | The modem has connected to the line, the DTE speed is 7200 bps and DTE speed |
|
| reporting is enabled. |
14 | CONNECT 12000 | The modem has connected to the line the DTE speed is 12000 bps and DTE speed |
|
| reporting is enabled. |
15 | CONNECT 14400 | The modem has connected to the line, the DTE speed is 14400 bps and DTE |
|
| speed reporting is enabled. |
45 |