Hi, friend.
You can perform the following operations to change the call source to which users belong:
1. Log in to the CLI of the U1900 gateway.
2. In Config mode, run config add callsource no 1 command to add call source 1.
3. In Config mode, run the config modify subscriber dn 7000 callsourceno 1 number 1 command to change the call source of the 7000 user to 1.
For details about the commands, see the Product Documentation.