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NetVanta 3200 Branch Office VoIP connection(s)

In a prior (similar) posting, I had setup two NetVAnta 3200 router connecting my production network to a branch office via a T1.  I was able to use those setting to implement another T1 connection to another branch office. Thank you 'jayh' for your assistance.

Currently, I'm reviewing the setting of the two routers in the hopes of establishing a VoIP system at the branch office to it will tie into our VoIP system in the main production network. As before, In our production network, our VoIP system is on a separate Vlan(200) with the ip scope of  I'm trying to figure out how the phone and VoIP server on the branch office side can talk to the production network via the Vlan 200

I have the following setup:

Production Network: - A SIDE

Branch Office Network: - B SIDE

Router (A-Side)



A Side Routing Table
A Side.gif

Router (B-Side)



B Side.gif

As before, any assistance would be greatly appreciated!

Randy Webster

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New Contributor

Re: NetVanta 3200 Branch Office VoIP connection(s)

Additional note... I'm attempting to configure the T1 to pass both data and voice communication

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Honored Contributor

Re: NetVanta 3200 Branch Office VoIP connection(s)

We use frame-relay encapsulation on T1 links to carry different classes of traffic. 

It's a bit tricky but essentially frame-relay allows you to have multiple virtual circuits on the same physical T1.  One virtual circuit will carry your data traffic and the other can carry voice.  So, you'll have a subinterface on the T1 for your existing data, and a second with a different identifier (called DLCI) for the voice.  Frame-relay configuration is a bit more complex than PPP or HDLC, and you'll have to make one end DCE and the other DTE, the circuits have a kind of gender relationship.

Normally I would just bridge the voice traffic if it's only supporting a few phones. Unfortunately the last time I checked you can't assign a subinterface to a bridge group (Please fix this, Adtran folks!)

So you could put the voice in a different VRF and route a new voice subnet to the remote side.  Both the VLAN subinterfaces at both ends and the frame-relay subinterfaces would need to be in the new VRF and you'll need to put appropriate routing in place as well as QoS.

Alternatively you might be able to use policy routing on both sides and keep the T1 with its present configuration, or even a tunnel or VPN.

3200 series are kind of lightweight so I don't know if they support policy routing, tunnel interfaces, and/or VRF so that might limit your choices.  TA900 series support these.

Not applicable

Re: NetVanta 3200 Branch Office VoIP connection(s)


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