06-17-2008 07:36 PM - edited 03-05-2019 11:41 PM
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?
Solved! Go to Solution.
06-23-2008 11:46 AM
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:
interface f0/xx
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.
06-23-2008 06:40 AM
Here is the URL for the configuration for the Voice VLAN which will help you :
06-23-2008 11:25 AM
hi this configuration works, for telephone device Linksys
interface FastEthernet0/23
switchport access vlan 2
switchport voice vlan 4
mls qos trust device cisco-phone
spanning-tree portfast
an this one, for other Manufacturer;
interface FastEthernet0/21
switchport access vlan 4
switchport mode trunk
Heiber
06-23-2008 11:52 AM
hi this configuration works, for telephone device Linksys
interface FastEthernet0/23
switchport access vlan 2
switchport voice vlan 4
mls qos trust device cisco-phone
spanning-tree portfast
an this one, for other Manufacturer;
interface FastEthernet0/21
switchport access vlan 4
switchport mode trunk
Heiber
06-23-2008 11:46 AM
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:
interface f0/xx
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.
06-23-2008 11:56 AM
Ericsson IP Phones can use Voice VLANs and it can all be automatic, you do however have to 'provision' things. Out of the box an Ericsson IP Phone will use DHCP and request Vendor Option 43 to discover the Voice VLAN. Your DHCP Server needs to respond with Option 43 which can tell it the Voice VLAN Tag and the Software Server IP address where it's configuration file is held (you can also optionally use Option 43 to tell the Phone its Telephony Domain Name, a Proxy Server IP Address and Proxy TCP Port no).
If you have access to the Ericsson ALEX documentation it is all detailed in there.
HTH
Andy
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