1.) Do I need to configure ports 2-22 as trunk ports using 802.1q encapsulation?
2.) Should I leave ports 1, 23-48 as access ports without modifying anything?
Both of these depend on whether you're only using a single cable drop to each location. If you're connecting a phone to that port and a PC through a switchport on the back of the phone, set them up as 802.1q trun kports.
3.) What configuration would I need to do on the router to make sure voice packets get routed across the WAN? Router has 2 FE interfaces.
This depends on your WAN connections. If you've only got one WAN connection the voice is going to get routed out that interface recardless. You won't have to do anything except NAT and depending on the way your voice service is setup you may have NAT traversal issues. Make sure that any firewalls you have setup hang long enough session timeouts to avoid having call signalling getting cut off in the middle of a call.
4.) Should Qos be configured on the switch or on the router or both?
QoS would typically be configured on both the swith and the router. In the end your bottleneck is going to be at the router WAN interface so this is where it will matter most but you need to be marking frames and packets from the phone (or PC if you have a soft client) and the entire network should be observing whatever marking scheme you use.
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by: bfasonPosted on 2008-02-03 at 21:58:17ID: 20812252
What type of phone system and which phones will you be using?
In most cases you will need to apply qos on both the router and the switch. How you do this will depend on the voip system.
You will need to trunk the port going to the router although the 3500 can do the intervlan routing if you want it to.
The 3500 supports the "voice vlan" option which helps it auto configure ports for use with phones with pc's attached. Depending on the phone system it can detect a voip phone and place it in the proper vlan without you having to specify at trunk port.
Hope this helps
B