Migrating Asterisk VoIP to new network

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I've an Asterisk server with 4 IP phones connected to it, and gotta move them to a new network (IP range). When changing the IPs and gateway of the server and the IP phones, the phones stop working and they display the message "no service", despite they can be pinged.

They're declared in the /etc/asterisk/sip_additional.conf with host=dynamic, so I assume they should be recognized automatically.

I suspect there's something missing for them to register. Any idea what I might be missing?

Thank you


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