1. The BSC must communicate properly with the BTS.
2. The BTS must be configured with TRXs.
3. At least one MS is in conversation.
| ID | Name | Description |
|---|---|---|
| IDTYPE | User Start Loop Type | Meaning: mode of starting loopback Value range: BYTMSI, BYIMSI, BYMSISDN, BYIMEI Explanation: 1. This parameter specifies the mode of starting the loopback of the remote speech channel. 2. If this parameter is set to BYMSISDN, it is recommended that you trace the calling party by using the called number. 3. If this parameter is set to BYTMSI or BYIMSI, you need to check the reassignment strategy on the MSC side. If the TMSI is carried, you can trace the MS by the TMSI; if the IMSI is carried, you can trace the MS by the IMSI. 4. If this parameter is set to BYIMSI, you need to check and ensure that the IMEI can be obtained on the MSC side. Default value: None |
| TMSI | TMSI | Meaning: TMSI Value range: 0-4294967295 Explanation: 1. This parameter specifies the TMSI. You need to set this parameter when User Start Loop Type is set to BYTMSI. 2. The length of the parameter must be eight digits. Default value: None |
| IMSI | IMSI | Meaning: IMSI Value range: 5-15 characters Explanation: 1. This parameter specifies the IMSI. You need to set this parameter when User Start Loop Type is set to BYIMSI. 2. The value of this parameter ranges from 00000 to 999999999999999. Default value: None |
| MSISDN | MSISDN | Meaning: MSISDN Value range: 3-16 characters Explanation: 1. This parameter specifies the MSISDN. You need to set this parameter when User Start Loop Type is set to BYMSISDN. 2. The value of this parameter ranges from 000 to 9999999999999999. 3. If the calling party is to be traced, the MSISDN is the called number, that is, the number that the MS calls. For example, if the called number is 12345, you need to set the MSISDN to 12345. If the called party is traced, the MSISDN is the calling number. In this case, the caller ID display function must be enabled. For example, if the caller ID displayed on the MS is 54321, you need to set the MSISDN to 54321; if the called ID displayed on the MS is 8654321, you need to set the MSISDN to 8654321. Default value: None |
| IMEI | IMEI | Meaning: IMEI Value range: 8-15 characters Explanation: 1. This parameter specifies the IMEI. You need to set this parameter when User Start Loop Type is set to BYIMEI. 2. The value of this parameter ranges from 00000000 to 999999999999999. Default value: None |
| LOPLOC | Loop Board Type | Meaning: type of the board where the loopback is performed Value range: GEIUA/GOIUA, PTUB Explanation: This parameter specifies the type of the board where the loopback is performed. Default value: None |
| LOPDIR | Loop Direction | Meaning: loopback direction Value range: MSC, BTS Explanation: This parameter specifies the loopback direction. Default value: None |