【Problem Analysis】:
1. Check the configuration. The mapping between the narrowband group and the LTE group is incorrect. After the configuration of the 670 gateway is modified, the voice service from the LTE network to the narrowband network is normal.
2. Enable the audio detection button of the corresponding channel, and connect the sound box to the audio detection interface on the rear panel of the gateway. You can hear the group call voice initiated by the vehicle-mounted terminal, indicating that the vehicle-mounted terminal can output voice properly. The 670 audio adapter receives voice but does not send it to the network port, indicating that the voice input does not meet the audio adapter detection requirements, this indicates that the frequency writing configuration of the vehicle-mounted terminal is incorrect.
3. Modify the frequency writing configuration of the vehicle-mounted terminal. The users in the narrowband interconnection group initiate a group call, and the LTE user can hear the voice.
【Root Cause】:
Moto vehide terminal frequency configuration error
【Solution Description】:
After modify the frequency writing configuration of the Moto-vehicle-mounted terminal，the issue has solved。
