# netstat -nlp | grep freeradius
udp 0 0 0.0.0.0:49077 0.0.0.0:* 1399326/freeradius
udp 0 0 127.0.0.1:18120 0.0.0.0:* 1399326/freeradius
udp 0 0 0.0.0.0:1812 0.0.0.0:* 1399326/freeradius
udp 0 0 0.0.0.0:1813 0.0.0.0:* 1399326/freeradius
The SIP server DHCP option carries either a 32-bit (binary) IPv4 address or, preferably, a DNS (RFC 1035 [6]) fully-qualified domain name to be used by the SIP client to locate a SIP server.