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What is the relationship between the U1900 series unified gateway and the IAD

The relationship between the U1900 series unified gateway and IAD is as follows:
The U1900 is networked with the IAD to implement SIP voice services. The U1900 functions as a SIP server, and the IAD functions as an access gateway. They together implement the VoIP services. The IAD connects to the U1900 using SIP.

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What is the matching relationship between IAD and U1900 voice gateway

IAD IAD version of V300R001 corresponds to the U1900 version of V100R001C01. IAD version of V300R002 corresponds to the U1900 version of the V100R001C20 and the V200R003 version.

How do I reset the password for the U1900 series unified gateways

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.

How do I change the time of the U1900 series unified gateways

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

Configuration for interconnecting the IAD with the U1900 series unified gateway

Configuration for interconnecting the IAD with the U1900: On the IAD, see the IP address of the U1900 as the SIP server. For details, see the IAD product documentation:

The relationship between UC solution version and unified gateway version

eSpace UC V200R003 correspond eSpace U1900 V200R003; eSpace UC V200R002 correspond eSpace U1900 V100R001C20; eSpace UC V100R002 correspond eSpace U1900 V100R001C01

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What is the relationship between the U1900 series unified gateway and the IAD

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