Hello, I manage a network consists of 29 cisco catalyst platform 4507, 2960, 2950, under a VTP domain, is being implemented voice over IP and I have problems with the network to be set up for that purpose.
The solution is the manufacturer for ericsson and have phones with port SW, computers that connect to this port left in the administrative network but the voice does not reach its VLAN, I have tested with this command swport voice lvan (the number of the voice Vlan) but not yet achieving the transit of voice packets.
what configuration I recommend?
The "switchport voice vlan" command uses CDP to both communicate the proper VLAN to the phone and to set the port to a limited trunking mode when an IP phone is detected as a CDP neighbor.
This works with Cisco phones and also with Polycom phones. It is not likely to be supported by Ericsson or other IP phone manufacturers that don't do CDP.
In this case, you'll have to configure the switch port and the phone manually for the voice VLAN.
On the switch, assuming VVV is the voice vlan and DDD is the data vlan:
switchport trunk encapsulation dot1q
switchport mode trunk
switchport trunk native vlan DDD
switchport trunk allow vlan DDD,VVV
---(appropriate qos configuration)---
You will need to read the Ericsson phone documentation to determine how to program the phone to use the assigned voice VLAN.