Configure DNSmasq for Asterisk central

Hello, how could I configure DNSmasq with asterisk? I understand that I need a DNS server so that IP telephones have communication with foreign telephones. But I don’t know how I could do it.

For a simple installation, you wouldn’t; you would use your router provided services. I’d suggest, for a system that required this, you would have an IT manager, who was designing for all users of the network, not just for VoIP.