372 APPENDIX A: CONFIGURING O PTION 184 ON A W INDOWS 2000 DHCP S ERVERCompleting theConfigurationAfter you have entered all elements in the new value, click OK. You returnto the Predefined Options and Values dialog box. The values that youentered appear in the Value area of the dialog box under Byte.The values appear in hexadecimal format although you entered them indecimal format.To accept the values, click OK. You return to the DHCP MicrosoftManagement Console dialog box.10 The length of the argument that applies to suboption 4 isdetermined by two elements:IP Address: The IP address of the device that is to becontacted if the VCX server cannot be reached. This requires4 bytes, one for each octet in the IP address.Dial String: The number pattern that determines which callscan be connected to the fail-over device. Limit: 254charactersThe format in which you enter the digits of the dial string is:■ 0 through 9: – Enter 00 through 09■ Wildcard: – Enter 0xAA which is the hexadecimal valuefor the asterisk (*) character.Note: The asterisk character must be the last character inthe dial string.Note: You can configure only one dial string in suboption 4.Example: The IP address is 192.168.15.254 and the fail-overdial string is 91*. This allows calls to be made to any numberthat begins with the digits 91.In this example, you enter 10 as the length of the argument(4 bytes for the IP address and 2 bytes for each of the threedial string digits).192 The first octet in the IP address168 The second octet in the IP address15 The third octet in the IP address254 The fourth octet in the IP address09 The first digit in the fail-over dial string (9)01 The second digit in the fail-over dial string (1)0xAA The wildcard (asterisk) character, entered in hexadecimalformat.Table 17 Configuring the Fail-Over Call Route Point (continued)What You Type Description
