Configuring a start mode for E&M signaling
E&M signaling supports the following start modes:
Immediate start—After off-hook, the originating side waits for a specified period of time to send the called number to the terminating side. During this period of time, the originating side does not check whether the terminating side is ready to receive the called number. The terminating side enters off-hook state after receiving the called number.
Figure 3: Immediate start
Delay start—The originating side goes off-hook and seizes the trunk. After detecting the seizure signal from the originating side, the terminating side enters the off-hook state and remains in this state until it is ready to receive the called number. Then, the terminating side enters the on-hook state and sends a signal to indicate that the line is idle. After receiving the idle signal, the originating side sends the called number to the terminating side, which relays the call to the user phone.
Figure 4: Delay start
Wink start—The terminating side remains in on-hook state until it receives the seizure signal from the originating side and then sends a wink to the originating side. After receiving the wink, the originating side sends the called number to the terminating side, which relays the call to the user phone.
Figure 5: Wink start
To configure the immediate start mode:
Step | Command | Remarks |
|---|---|---|
1. Enter system view. | system-view | N/A |
2. Enter E&M interface view. | subscriber-line line-number | N/A |
3. Configure the immediate start mode for the E&M interface. | signal immediate | The default is the immediate start mode. |
4. Set a delay for the originating side to wait to send DTMF tones in immediate start mode. | delay send-dtmf milliseconds | The default is 300 milliseconds. Use this command on the originating device. |
To configure the delay start mode:
Step | Command | Remarks |
|---|---|---|
1. Enter system view. | system-view | N/A |
2. Enter voice interface view. | subscriber-line line-number | N/A |
3. Specify the delay start mode for the E&M interface. | signal delay | The default is the immediate start mode. |
4. Set the seizure signal duration in delay start mode. | delay hold milliseconds | The default is 400 milliseconds. Use this command on the terminating device. |
5. Set the delay time from when the terminating side detects a seizure signal to when it sends the seizure signal in delay start mode. | delay rising milliseconds | The default is 300 milliseconds. Use this command on the terminating device. |
To configure the wink start mode:
Step | Command | Remarks |
|---|---|---|
1. Enter system view. | system-view | N/A |
2. Enter voice interface view. | subscriber-line line-number | N/A |
3. Specify the wink start mode for the E&M interface. | signal wink | The default is the immediate start mode. |
4. Set the delay time from when the terminating side receives a seizure signal to when it sends a wink signal in the wink start mode. | delay send-wink milliseconds | The default is 200 milliseconds. Use this command on the terminating device. |
5. Set the duration of a wink signal sent by the terminating side in wink start mode. | delay wink-hold milliseconds | The default is 500 milliseconds. Use this command on the terminating device. |
6. Set the timeout time for the originating side to wait for a wink signal after sending a seizure signal in the wink start mode. | delay wink-rising milliseconds | The default is 2000 milliseconds. Use this command on the originating device. |