VOIP configuration on HP 3500 switch

Hello All -

I am in the process of deploying a VOIP system. I will be using an HP 3500 POE switch for the phones as well as the workstations. I am planning to have all 48 ports in the native VLAN. Also, I will have ports 2-22 on VLAN 10 (which is configured for Voice. We only have 20 phones). All the workstations will be connected to the phones. Ports 2-22 will be tagged and ports 1,23-48 will not be tagged.
The signaling server for the VOIP phone is in another subnet. We will be using a Cisco 1841 router to connect to that subnet. Following are my questions:
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?
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.
4.) Should Qos be configured on the switch or on the router or both?

Any help would be greatly appreciated!
Thanks!
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bfasonConnect With a Mentor Commented:
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
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Reid PalmeiraConnect With a Mentor Telecom EngineerCommented:
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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gwerner99Connect With a Mentor Commented:
1. You only have one 3500 switch so trunking on is not necessary, it would be used for switch to switch negotiation.
2. thats you option.
3. Phone systems with VoIP use ports 5060 and 10000 - 20000 for almost all communications. Open udp with the ports and you should be able to talk.
4.You will need some sort of QOS on the lan and then on the connection. What protocol are you going to use. G711 or G729a/ab ?? That will determine the bandwidth and needed items.
If you need any technical Help we have formed a VoIP company selling SIP trunks and all data conectivity items. RTNS,Inc  www.rtnsinc.com  we are working on finishing the site for use to the business public.  GWerner99
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