DNS Addressing

As of Release 1.5, the 4600 IP Telephones support DNS addresses as well as dotted decimal addresses. The telephone attempts to resolve a non-ASCII-encoded dotted decimal IP address by checking the contents of DHCP Option 6, as indicated in DHCP Generic Setup. At least one address in Option 6 must be a valid non-zero dotted decimal address - otherwise, DNS will fail. The text string in the system parameter DOMAIN (Option 15, see Table 4-5) is appended to the address(es) in Option 6 before the telephone attempts to resolve the DNS address. If Option 6 contains a list of DNS addresses, they are queried in the order given if no response is received from previous addresses on the list. As an alternative to administering DNS via DHCP, you may specify the DNS server and/or Domain name in the TFTP script file (in which case, you should SET the values for DNSSRVR and DOMAIN first; then you may use those names later in the script).