What to look for if a Cisco phone says "network initialization"?

Question

Telephony

I'm with telephony on "sorry please", so I'm turning here. The essence of the question is as follows:
When setting up, the phone is initialized and works fine, when you try to connect to any of the ports, the user writes "network initialization". Telephony is controlled by Asterisk, connected to the local network under the control of RouterOS (Mikrotik), DHCP-server on the Active Directory domain controller.
I understand that the information is not enough to fully understand the essence of the problem, but I need ideas in which direction to work, what to check. There were no problems with other phones.

Answer 1

View network settings. If the user has any other device on the switch working fine, I would look at the following:
Is cdp, lldp enabled on the phone.
Is voice vlan configured correctly on the switch.
Is voice vlan manually registered on the phone.

Answer 2

It turned out that the problem was in DHCP. Perhaps something ciskovskoe pedigree, but rather we have some problems on the server. The phone did not receive an address on one subnet, but received it on the other two, while other clients received addresses. As a result, I reserved the address in the desired subnet, the phone started up correctly.