Filter
Top Products
DHCP
Issue 2.2 April 2005 51
- Option 52 - Overload Option, if desired. If this option is received in a message, the
telephone interprets the sname and file fields in accordance with RFC 2132,
Section 9.3.
- Option 58 - DHCP lease renew time, if desired.
- Option 59 - DHCP lease rebind time, if desired.
- Option 66 - TFTP Server Name.
- A 4600 Series IP Telephone-specific DHCP option specifying information such as
TFTP server and Avaya Media Server Gatekeeper IP Addresses. Use the
Site-Specific Option Number (SSON) at #176. You can set this option’s value, for
example, to either of the following strings:
MCIPADD=xxx.xxx.xxx.xxx,MCPORT=yyyy,TFTPDIR=<path>,TFTPSRVR=
zzz.zzz.zzz.zzz
OR
MCIPADD={list of DNS names}, MCPORT=yyyy, TFTPDIR=<path>, TFTPSRVR= {list
of DNS names}
Note:
Note: List the TFTPDIR value before the TFTPSRVR value, if the latter is specified in
the SSON.
Note:
Note: Some DHCP applications limit the length of Option 176 to 247 characters.
● Comply with the DHCP standard by setting DHCPSTD to “1”, or
● Continue to use its IP Address after the DHCP lease expires by setting
DHCPSTD to “0”.
The latter case is the default. If the default is invoked, after the DHCP lease
expires the telephone sends an ARP Request for its own IP Address every five
seconds.
The request continues either forever, or until the phone receives an ARP Reply.
After receiving an ARP Reply, the telephone displays an error message, sets its
IP Address to 0.0.0.0, and attempts to contact the DHCP server again.
Note:
Note: Microsoft DHCP servers support only dotted-decimal format for file server
addresses, not symbolic names. Option 66 need not be used if the TFTP
server is identified in the Site Specific Option Number string (Option 176),
or if HTTP is to be used exclusively instead of TFTP. However, to simplify
configuration, we recommend that you use Option 66 if you are using
TFTP. If you use both Option 66 and Option 176 to identify TFTP servers,
the value(s) in Option 176 overrides the value(s) in Option 66.