Mega basic VLAN question that I can't seem to solve.

Hi,

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Really need a bit of advice to fix this scenario.

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Mega basic config, but can't seem to get this working.

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Basically, I have a Cisco switch with DHCP enabled for voice (don't have access to this), connected to a Dell fibre distribution switch (Powerconnect 6024F), where I then have to pass traffic across to a 3560 and down to a VoIP telephone.

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I want to tag the packets when they leave the Cisco voice, so they can be passed across the Dell, to the 3560, to the phone.

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Current theoretical config that doesn't seem to work:

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Cisco (voice/DHCP) - Dell (port 16, configured as access on VLAN 999)

Dell - Cisco 3560 (already configured as a trunk, added VLAN 999)

Cisco 3560 trunk (already configured, has "trunking VLANs Enabled: ALL" in the config, so assuming that it'll accept my VLAN 999)

Cisco 3560 - test VoIP telephone - Access port on 999

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Reaching out and would really appreciate some pointers in where the config doesn't look correct?

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Can post configs if required.

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Thanks,

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/storr84