IP-Phones DHCP Option 43 correct String

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atreju
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Posts: 1
Joined: 05 Dec 2017 09:53

IP-Phones DHCP Option 43 correct String

Post by atreju » 05 Dec 2017 11:00

Dear all

We have OXE with OT and Alcatel 8028 and 8068 Phones. We have Windows DHCP with the Option 66 (TFTP Server) configured, we have Cisco Switches witch Access and Voice VLAN defined.

Everything works fine.

Now I have the challenge that I need to set up a Linux - based DHCP Server (Sophos Firewall with built in DHCP functions) and the correct DHCP options.

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?

We have:

Voice VLAN ID 6
TFTP-Server: 172.16.6.50

Thank you very much
Kind regards
Atreju

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dryhouse
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Posts: 157
Joined: 06 Apr 2010 06:11
Location: Madrid,Spain

Re: IP-Phones DHCP Option 43 correct String

Post by dryhouse » 07 Dec 2017 09:51

may the force be with you....

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