4600 Series IP Telephone LAN Administrator’s Guide
Administering Options for the 4600 Series IP Telephones
4-24
A to destination B), jitter, etc. RTCP itself does not improve QoS, but it provides inf ormation to you
to help identify where problem areas might be.
You cannot change the telephone’s RSVP or RTCP parameters directly on the telephone or via
TFTP or DHCP administration. The only way to change these parameters is by appropriate
administration of the switch. See your DEFINITY®/MultiVantageTM administration material for more
detail.
Administering Options for the 4600 Series IP Tel ep ho ne s 4
As indicated in the Introduction of this chapter, there are many parameters that can be
administered for the 4600 Series IP Telephones. This section explains how to change parameters
via the DHCP or TFTP servers. In all cases, you will be setting a system parameter in the
telephone to a desired value. Table4-4 lists the parameter names, their default values, the valid
ranges for those values, and a description of each one. For DHCP, the parameters below are set
as desired to desired values in the DHCP Option as discussed in DHCP Generic Setup earlier in
this chapter. For TFTP, the parameters below are set as desired to desired values in the TFTP
Script File as discussed in Contents of the Upgrade Script also earlier in this chapter.
TFTP Scripts are the recommended way to administer options on the 4600 Series IP Telephones.
Some DHCP applications have limits on the amount of user-specified information; such limits
could be exceeded by the administration required, for example, a 4630 with all applications
administered.
DNS Addressing 4
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, page 4-7. 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 Table4-4) 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. Alternatively 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).
If Options 6 and 15 are appropriately administered with DNS servers and Domain
names, respectively, MCIPADD and TFTPSRVR settings need not be specified in the
Site Specific Option string.