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As of Release 1.5, the 4600 IP Telephones support DNS addresses and dotted decimal addresses. The telephone attempts to resolve a non-ASCII-encoded dotted decimal IP Address by checking the contents of DHCP Option 6. See DHCP Generic Setup for information. At least one address in Option 6 must be a valid, non-zero, dotted decimal address, otherwise, DNS fails. The system parameter DOMAIN’s (Option 15, Table 10) text string 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, those addresses are queried in the order given if no response is received from previous addresses on the list. As an alternative to administering DNS by DHCP, you can specify the DNS server and/or Domain name in the TFTP or HTTP script file. But first SET the DNSSRVR and DOMAIN values so you can use those names later in the script.
NOTE: If you administer Options 6 and 15 appropriately with DNS servers and Domain names respectively, you do not need to specify MCIPADD and TFTPSRVR settings in the Site Specific Option string.
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