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We have a cisco phone system setup successfully.

I am setting up a bunch of phones, of which, one keeps getting an data vlan ip address from the DHCP server.

Any suggestions?

I have factory reset the phone a number of times.

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Can you verify that the switch port that it's in is configured correctly, or alternately try plugging it in to a known working port? – Shane Madden Jan 16 at 22:33
Have tried it on ports I can configure other phones on and other various ports with the same result. It gets an IP from the data vlan :( – Lance Jan 16 at 23:13
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I'm assuming you mean the 7961 as I can't find any reference to a Cisco 7661 phone.

Sorry I'm not familiar with the methods used for Cisco's to automatically discover voice VLAN's but a temporary bodge - press settings, **#, then Network configuration, then Operational VLAN ID, and manually enter the desired VLAN.

Also it may be worth doing a factory reset prior to this - pull the power (or network lead if powered via POE), then hold down the # key and power the phone up. Keep holding # until the line buttons blink in sequence, then enter 123456789*0# and the phone should reset to factory settings, then pull needed files. (As you have a Cisco phone system, I'm assuming you have the correct DHCP option for your TFTP server set, as well as the relevant firmware and provisioning files on the TFTP server - if you factory reset without these you will end up with a useless phone).

If after a factory reset it still doesn't behave on known good ports, I would factory reset a known good phone on a known good port just to ensure VLAN wasn't set manually before opening a support case with Cisco.

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Have definitely factory reset a few times without any love... but the **# thing is a godsend! I knew you would be able to manually set things somehow! I'll test this then upvote if works :) – Lance Jan 17 at 4:50
Oddly enough, even though **# lets me edit some of the settings, Operational VLAN is not one it lets me set manually... blaaaah! Interestingly enough under Security Configuration there is a listing 'Voice VLAN Enabled' and it says no. ANOTHER uneditable field :( – Lance Jan 17 at 4:56
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I don't know what you are using as switches, but on catalyst the following configuration should help:

interface FastEthernet0/12
 switchport access vlan <data vlan id>
 switchport voice vlan <voice vlan id>

Another thing to look at IIRC: the Cisco phones are using CDP to discover the voice vlan and hop into it. While disabling CDP sounds interesting for security reasons, it may break the whole voice lan.

Switch#conf t
Enter configuration commands, one per line.  End with CNTL/Z.
Switch(config)#cdp run
Switch(config)#interface range fastEthernet 0/1 - 24
Switch(config-if-range)#cdp enable
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Amazing advice! But unfortunately this is already configured and my phone system / switch and router setup is working perfectly fine with every other phone... I setup 49 of them before this bugger! Might just be faulty hardware in some way! – Lance Jan 17 at 21:23
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