There are some aspects of your question that are not clear to me. Is the time server at the head office a router at the head office or is it some other device? I am not clear what you mean when you say that the NTP server is running in client-server mode. I am not clear whether the 2800 routers are the head office routers, the remote office routers, or both. Perhaps you can clarify some of this.
Knowing some of these details might change how I would answer. But the general answer is that if the clients are properly set up to send NTP requests to the server, then there is no configuration required to have the routers forward the NTP packets. NTP packets are regular IP packets and the routers should forward them normally.
If there is some aspect to your question that I have not understood adequately then perhaps you can help me understand it better.
That does clarify several aspects. And it helps confirm my original answer. In what you have described the client sends an NTP request, which is a normal IP packet and it will be routed by normal methods with no special configuration. And the NTP server will send a response which is a normal IP packet and it will be routed by normal methods with no special configuration.
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