I have setup:

  • VLAN 1 and subnet for data

  • VLAN 100 and subnet for voice

  • IP phones get their IP via DHCP on the subnet

  • all other IP devices get their IP on subnet

I am using "Cisco Unity Connection" for auto-attendant and voicemail.

Question 1: In which subnet "Cisco Unity Connection" server should be put?

subnet or subnet

Question 2: The "Cisco Unity Connection" server VM is running inside a Vmware ESXi host. In which subnet Vmware ESXi host should be put?

subnet or subnet

I am asking these questions with QoS in mind, with voice traffic prioritization perspective.

Thank you for your help.

  • Did any answer help you? If so, you should accept the answer so that the question doesn't keep popping up forever, looking for an answer. Alternatively, you could post and accept your own answer.
    – Ron Maupin
    Commented Dec 21, 2020 at 3:03

1 Answer 1


I'll suggest using a third vlan for infrastructure.

Depending on what your are using for routing between vlan, this may help you to protect your infrastructure (access list, firewalling), enable QoS on both "user" subnets (voice and data) aso.

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.