Option 66 is not actually the PABX. Also the terminating FF in the documentation is not required - for example 3a 02 VV VV FF for VLAN VVVV.2. AVA will not work if you use 'vendor class' entries on the DHCP scope, only the standard option 43 works and a second discovery only happens if the VLAN is not the correct one and the phone remembers the last VLAN. Use the helper-address option and add the IP address of the DHCP server that.Now I am really struggling with the DHCP Server because custom vendor-classes is not 'possible' on Sophos DHCP like on Windows DHCP.Configuring the 'standard' Option 66, 67, 150 does not work - the phone always says 'Bad tftp1 address'.So I guess I need to configure option 43 (which is supported by Sophos DHCP) with the correct HEX value for our environment.But now the real challenge begins > I am not able to figure out the correct string.How option 43 works is almost clear to me, but everything I tried did not work.Could anyone help me with the correct option 43 for Alcatel ipPhone?I am also unsure as to how this is all supposed to work and there seems to be no definitive explanation of the whole process that is available.I am certainly no expert on DHCP so I could be wrong about some of this but this is what I believe at the moment.1. View solution in original post.On your Windows DHCP server you must create the superscope to offer the IP. Otherwise, if the DHCP is still a 3rd party machine (Windows, Linux, Infoblox, etc.) then you have nothing to configure in Meraki.

You IT types may think I am stating the bleeding obvious here but not coming from a server background these issues had to be nutted out with lots of reboots and traces as it is not obvious to the non IT fluent. Entering this will match the documentation but create mal-formed packets in the offer.Getting my head around these few issues seems to have fixed the problems I had when I followed the documentation but this is by no means a definitive explanation. This is calculated and added automatically to the offer by the server (at least on WIN2012 DHCP). When entering the data into Option 43 DONOT start the hex string with 2B XX where XX is the length of the full string. For example - Option 66 would contain 192.168.92.246 for an IP Touch and 192.168.92.246:10443 for an 8082 handset.4. For the operating voice VLAN, set the Vendor Class option 43 to contain sub-options 66 (42h) and 67(43h) for the specific phone type (IP_Touch, IC_Touch, SIP, Mobile etc.) with the specific info required for each phone type.

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Windows Dhcp Server Option 150