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DHCPACK messages
If the value of NVVPNMODE is "1" and the value of VPNACTIVE is "0", the values of the following
parameters will be set based on the fields and options received in the DHCPACK message when
DHCP is in the INIT state (converting from binary to ASCII as necessary):
• The parameter EXTIPADD will be set to the value of the yiaddr field,
• The parameter EXTNETMASK will be set to the value of option #1 (if received),
• The parameter EXTGIPADD will be set to the first value of option #3 (if received, which may be
a list of IP addresses),
• The parameters DNSSRVR and EXTDNSSRVR will be set to the value of option #6 (if
received, which may be a list of IP addresses),
• The DHCP lease time for EXTIPADD will be set to the value of option #51 (if received),
• The DHCP lease renew time for EXTIPADD will be set to the value of option #58 (if received),
• The DHCP lease rebind time for EXTIPADD will be set to the value of option #59 (if received).
If the value of NVVPNMODE is "1" and the value of VPNACTIVE is "1", the values of the following
parameters will be set based on the fields and options received in the DHCPACK message
(converting from binary to ASCII as necessary):
• The parameters TLSSRVR and HTTPSRVR will be set to the value of the siaddr field if and
only if the siaddr field is non-zero,
• The parameter DNSSRVR will be set to the value of option #6 (if received, which may be a list
of IP addresses), and
• The parameter DOMAIN will be set to the value of option #15 (if received).
Time to service functionality
Important:
Some vendors may have gateways that interfere with TTS functionality. Avaya recommends
always setting the system parameter VPNTTS to "1" (On) unless you determine that your
gateway interferes with TTS. If you determine that your gateway interferes with TTS, set or
leave the VPNTTS default of "0" (Off), which turns off TTS.
VPN parameters
48
VPN Setup Guide for 9600 Series IP Telephones
March 2015