I'm new to this organization and their cisco switch setup is giving me a headache.
we have Voip setup with vlans and all, but the ports carrying voip have been set as trunk ports. I want to make them normal access ports that can carry voice traffic. But whenever i do so, the phones refuse to register.
This is the current setup of a voip port:
interface GigabitEthernet1/0/10
switchport trunk native vlan 21
switchport trunk allowed vlan 20,21
switchport mode trunk
switchport voice vlan 20
spanning-tree portfast
This is what I did:
no switchport trunk native vlan 21
no switchport trunk allowed vlan 20,21
switchport mode access
switch access vlan 21
switchport voice vlan 20
But it shows phone unregistered.
VLAN 21 = data vlan
VLAN 20 = voice
the native vlan on the real trunk link is vlan 1
why does it work when the interface is a trunk but doesnt work when i change it to my configuration?
Switch is a cisco 2960 and IP phone is a CP 7821
