Using HP 3800 L3 switch for Routing

I attached a Visio file so you can see a sample generic portion of my current configuration.  I am wanting to remove the MSR 20-20 Router in the bottom middle connected to the x300 Firewall/MetroEthernet/Internal Switch as it is a bottleneck to our network (for some reason my boss wanted a router comparable to a 3com 5009 and I had no say in it).  It is a basic branch router and only allows 184,000 packets per second and all Internet traffic, Metro Ethernet Traffic and internal LAN traffic at our main site passes through it.  We are experiencing a high volume of dropped calls from every site connected to our Metro Ethernet as well as other disconnect issues.  The Shoretel Rep and outside Network Consultant said it was the likely culprit.  I figured instead of buying a new Router I could just use the L3 switch since there isn't anything special about this router and it is cheaper than buying another dedicated router.  I know on Cisco it is as simple as typing in "No Switchport" and boom, you have a routing port.  Apparently HP switches don't do it like that.  Any help is much appreciated.  Thanks.
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David Johnson, CD, MVPOwnerCommented:
First Impression: A switch is not really a router and using one as the other is looking for trouble
If you are convinced then you create a new vlan in the switch, configure the router port and set the port (connected to your ISP's modem) VLID (PVID) to the desired vlan).

Not recommended add a simple server (i.e. linux based) with a firewall and 2 ethernet ports as a router and keep the switch where it belongs.

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