Does the U1900 series unified gateway support loopback test

During the device restart, enter R when the system prompts you to press R to restore the default password. At the prompt "[.Conform to restore password.](Y/N):>", enter Y. The following information is displayed: Success to restore default password! Success to save default password! Then, you can use the default password to log in to the gateway.

Run the config system date command to change the time in YYYY-MM-DD format.

All U1900 series unified gateways support SIP/SS7/PRA/R2/QSIG Trunk. U1910/U1911/U1930/U1960/U1981 also support AT0 Trunk, U1980 doesn't support AT0 Trunk. U1911/U1960/U1981 support BRI Trunk, while U910/U1930/U1980 doesn't support BRI.

The U1900 series unified gateway mainly supports two types of services: basic services and supplementary services. - The basic services include intra-office calls, narrowband inter-office calls, and broadband inter-office calls. - The supplementary services supplement basic call services, including calling line identification presentation (CLIP), call forwarding, call transfer, call hold, call park, call waiting, three-way calling, conference call, and outgoing call barring (OCB) services. For more details, see the Feature Guide of the U1900 product documentation.

For detailed deployment and upgrade methods, see the upgrade guide of the U1900 series unified gateway: