User's Manual

Option 51, the phone uses the default value of T1 (renewal timer)
according to IETF RFC 2131, Section 4.5.
- Option 59: DHCP lease rebind time. If the B189 Conference IP phone
does not receive this parameter, or if this value is greater than that for
Option 51, the phone uses the default value of T2 (rebinding timer)
according to RFC 2131, Section 4.5
- Option 242: Site-Specific Option Number (SSON). You do not have to
use Option 242. If you do not use this option, you must ensure that you
administer the key information, especially HTTPSRVR and MCIPADD
appropriately elsewhere.
An example of proper DHCP administration is:
Option 242 for DHCP: MCIPADD =xxxx.xxx.xxx.xxx
Result
In the following table, DHCPACK Setting of Parameter Values on page 45 the B189
Conference IP phone sets the following parameter values to the DHCPACK message field and
option.
Table 7: DHCPACK Setting of Parameter Values
Parameter
Set to
DOMAIN If received, Option #15.
DHCP lease renew time Option #58 (if received).
DHCP lease rebind time Option #59 (if received).
DHCP lease time Option #51 (if received).
DNSSRVR Option #6.
HTTPSRVR The siaddr field, if that field is not a zero.
TLSSRVR The siaddr field, if that field is non zero.
Because the DHCP site-specific option is processed after the DHCP fields and standard
options, the values set in the site-specific option supersede any values set by DHCP fields or
standard options, as well as any other previously set values.
You cannot set parameters L2Q and L2QVLAN from a site-specific option if the parameter
values were previously set by LLDP. For more information, see
About Link Layer Discovery
Protocol (LLDP) on page 66.
Note:
The B189 Conference IP Phones do not support Regular Expression Matching, and
therefore, do not use wildcards.
Setting up the DHCP server
Administering Avaya B189 Conference IP Phone December 2013 45