Avaya IP Telephony Generator

Generate Option 176 for Avaya 4600/5600/9600-series IP phones and IP Office

Call Server IP Address (MCIPADD) * IP address of the Avaya Call Server / Media Server that phones register to

Call Server Port (MCPORT) * H.323 signaling port, almost always 1719

TFTP Server IP Address (Optional) TFTP server for firmware/settings, if different from the call server. Key spelling (TFTPSRVR vs TFTPSERVER) varies by phone firmware — check your model's admin guide.

Generated Output

ISC DHCP (dhcpd) Configuration

Add the generated line to your dhcpd.conf file within the appropriate subnet or host block:

Open your /etc/dhcp/dhcpd.conf file
Locate the subnet or host block where you want to apply this option
Add the generated line from above
Restart the DHCP service: systemctl restart isc-dhcp-server

Infoblox Configuration

Use the hex value above to configure DHCP Option 176 in Infoblox:

Log in to the Infoblox Grid Manager (NIOS)
Navigate to DHCP → DHCP Options (or Data Management → DHCP → Options)
Select or create the DHCP option set you want to modify
Click Add or edit Option 176
In the option configuration:
- Set Option Type to "Hex" or "Binary"
- Enter the hex value from above in the Value field
- The format should be: XX:XX:XX:XX (with colons)
Click Save or Save & Close
Apply the option set to your network view, network, or DHCP range as needed

Screenshot placeholder: Infoblox DHCP Options configuration screen

Important: The hex value format uses colons (:) as separators. Copy the value exactly as shown above, including the colons.

Windows DHCP Server Configuration

Configure DHCP Option 176 using the hex value above:

Open DHCP Manager (run dhcpmgmt.msc or search for "DHCP" in Start menu)
Navigate to your DHCP server → IPv4 → Server Options (for all scopes) or Scope Options (for specific scope)
Right-click on Server Options or Scope Options and select Configure Options
In the General tab, scroll down to find Option 176
Check the box next to Option 176
In the Data entry section:
- Select Binary or Hex as the data type
- Enter the hex value from above in space-separated format: XX XX XX XX
- Alternatively, you can enter it as a single hex string without spaces
Click OK to save the configuration

Screenshot placeholder: Windows DHCP Server Options configuration dialog

Alternative Method (PowerShell):

# Convert hex string to byte array and set option
# Replace "HEX_VALUE_HERE" with the raw hex value from above (no spaces, no colons)
$hexValue = "HEX_VALUE_HERE";
$bytes = ($hexValue -split '(..)' | Where-Object { $_ }) | ForEach-Object { [Convert]::ToByte($_, 16) };
Set-DhcpServerv4OptionValue -OptionId 176 -Value $bytes

Note: Replace HEX_VALUE_HERE with the raw hex value from the "Raw Hex" tab above (no spaces, no colons).

Raw Hex Value

This is the raw hexadecimal value without any formatting. Use this for:

Manual configuration in systems that require raw hex
Scripts and automation tools
Testing and validation