DHCP option 43 setup for VOIP Phones

[zpayne]

I am trying to use DHCP option 43 to set the VLAN for a VOIP Phone. I have a VLAN 10 for VOIP and VLAN 20 for DATA. I have the DATA 20 vlan untagged on the switch and the VOIP 10 vlan tagged on the switch port. I have the DHCP option 43 set on the DATA 20 vlan options as a string in HEX for the VOIP vlan tag. I am not sure what I am missing here to make this work but there is not much for information out there for this setup.

Thanks,

[JKnott]

@zpayne

Is the option going out in the DHCP packets? Is it the phones aren't accepting it?

[zpayne]

@jknott From what I am getting from a capture the option is not going out.

[michmoor]

@zpayne are you setting it in the DHCP Server settings in pfsense (assuming that’s your dhcp server)

[zpayne]

@michmoor Yes, that is correct, I have DHCP set up on the vlan 20 and vlan 10.

[michmoor]

@zpayne what VOIP phone do you have?

[zpayne]

@michmoor I am using Grandstream (GRP Series) phones connecting back to a Grandstream UCM. The are supposed to use option 43 to get the vlan ID and I have the set via hex with a string type on the option.

[michmoor]

@zpayne
Are you formatting it correctly in pfsense?
You got a screenshot?
https://www.grandstream.com/hubfs/Product_Documentation/DHCP_Options_Guide_Linux.pdf

[zpayne]

@michmoor Here is what I have it set like on the gui

[JKnott]

@zpayne

Here's some more info that might help:

VLAN ID Discovery over DHCP

[zpayne]

@jknott So I recieved this from the vendor, but I am still not able to get the data to go out. I have set this like recommended here.

https://service.snom.com/display/wiki/DHCP+options#DHCPoptions-Option43(vendor-encapsulated-options)

You're using DHCP option 132 and 133 using for the VLAN tags in the router,
although, to have this working you have to encapsulate in the DHCP 43, encapsulate the content of DHCP option 132 for the VLAN

So,
You'll need to configure the devices from Network -> Advanced Settings and set these values as follows:

• Enable DHCP VLAN: Enabled.
• Enable Manual VLAN Configuration: Disabled.
• Enable LLDP: Disabled.

Then, on a router, you will need to set the DHCP option 43 as described on the following link:
** https://service.snom.com/display/wiki/DHCP+options#DHCPoptions-Option43(vendor-encapsulated-options)

According the link , For example,
for VLAN 10 should be
84:03:31:30:00;

for VLAN 20 should be
84:03:32:30:00;