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1. Start the Tftpd32 application.
2. Select the Current Directory and Server interfaces.
3. Click the DHCP server Tab.
4. Click the "Settings" button.
   

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5. Select the DHCP Server
6. Select the DHCP Tab and DHCP Tab and configure the options.
   

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7. Click the "OK" button .

Open the DHCP VLAN on the Htek IP Phones

DHCP VLAN is "Disable" on IP phones by default. You can open DHCP VLAN via web interface or LCD interface. The DHCP option is 132.
To configure DHCP VLAN feature via web interface:
1. Log into the web interface.
The default username and password are both "admin".
2. Click on Network->Advanced.
3. In the DHCP VLAN field, select the desired value from the pull-down list.
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4 4. Click the "SaveSet" button and a window pops up.
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5. Click OK to reboot the phone.
To configure DHCP VLAN feature via LCD interface:
1. Press Menu →Settings →Advanced Settings(The default password is "admin") →Network →DHCP Vlan.
2. Press and or press Switch soft key to select the Enable choice from the DHCP Vlan field.
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3 3. Click the "Save" button and then reboot the phone manually.

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When the IP phone is configured to use DHCP for VLAN discovery, and the DHCP option is set to 132, the following processes occur:
1. The IP phone broadcasts a DHCP Discover message to find out if there is a DHCP server available.
2. If the DHCP server sends a DHCP Offer message with the Option 132, the phone will accept the Offer, send a DHCP Request, and save the VLAN ID provided by the DHCP server in the DHCP option 132.
3. After the DHCP server has sent the ACK message to the phone, the phone will
release the leased IP address and start a new DHCP Discover cycle using the now
known Voice VLAN ID tag.
After this process, the phone will send all packets with the VLAN ID learned from the DHCP server in the DHCP option 132.
The following figure shows the DHCP messages sent and received by the IP phone:
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To configure DHCP option 133

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When using Bridge Mode, PC Port VID is supported. When your PC is connected to LAN Port, data (from your PC to switch) will be tagged with " PC Port VID ".
Network-->PC Port (PC Port is LAN)
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Network-->Advanced
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Then VOIP (SIP RTP) packets send out from device will be tagged with VLAN id 66, Data packets which send from your PC to switch will be tagged with VLAN id 18.
IP Phone
PC InternetSWTICH
VoIP VID 66Data VID 18
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Or PC Port VID is 0 (UNTAG VLAN ID), then VOIP (SIP RTP) packets send out from device will be tagged with VLAN id 66,  Data packets which send from your PC to switch will UNTAG VLAN ID.
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IP Phone
PC InternetSWTICH
VoIP VID 66Data NO VIDImage Added

VLAN under NAT Mode

When using NAT mode, VLAN id is based port, you can't set Data VLAN id. If VLAN id arrange to the device is 66, then please set VLAN id: 
Network-->PC Port (PC Port is LAN)
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Network-->Advanced
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In this case, all Ethernet packets sent out from device will be tagged with VLAN id 66.