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Hi, I'm trying to network 2 7100 together with VPN/GRE IPSEC. I can't seems to get the rtp to work. Any help is appreciated.
Here is what I did.
I created a vpn
Then set it to GRE over VPN
I've created a loopback ip for both system.
Then I tie the system together. (I've used it loopback ip the sip server).
Here is where I think the problem is.
Every ip interface has ip media gateway.
Public interface - what should the ip media gateway be set to?
Tunnel interface - what should the ip media gateway be set to?
Prinvate interface - what should the ip media gateway be set to?
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There are a couple of ways to make this work. If you use a loopback interface you will want to assign it an unused IP address from the voice vlan with a 32 bit mask. You can have the tunnel 1 and private interface point to the loopback interface with the media-gateway ip loopback 1 command. If you do that, the SIP trunk configuration on the remote unit would need to point to the local loopback 1 interface IP address. The SIP server configured on the local phones (IP Phone Configs > select a phone and click edit > go to the Phone Settings tab) would also need to point to the local loopback 1 interface IP address. The public interface would not matter in this case unless a public SIP trunk is used. This approach is outlined in our SIP Networking Guide here:
Configuring SIP Trunking and Networking for the NetVanta 7000 Series
Alternatively, you can omit the use of a loopback interface since the tunnel has its own IP address that can be used for media. If this method is used the tunnel 1 interface would be configured with the normal media-gateway ip primary command. The private interface would also be configured with the media-gateway ip primary command. The remote SIP trunk would need to point to the local tunnel 1 interface IP address (not the tunnel source address), and the SIP server for the local phones would need to be configured for the local voice vlan IP address.
Thanks,
Matt

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There are a couple of ways to make this work. If you use a loopback interface you will want to assign it an unused IP address from the voice vlan with a 32 bit mask. You can have the tunnel 1 and private interface point to the loopback interface with the media-gateway ip loopback 1 command. If you do that, the SIP trunk configuration on the remote unit would need to point to the local loopback 1 interface IP address. The SIP server configured on the local phones (IP Phone Configs > select a phone and click edit > go to the Phone Settings tab) would also need to point to the local loopback 1 interface IP address. The public interface would not matter in this case unless a public SIP trunk is used. This approach is outlined in our SIP Networking Guide here:
Configuring SIP Trunking and Networking for the NetVanta 7000 Series
Alternatively, you can omit the use of a loopback interface since the tunnel has its own IP address that can be used for media. If this method is used the tunnel 1 interface would be configured with the normal media-gateway ip primary command. The private interface would also be configured with the media-gateway ip primary command. The remote SIP trunk would need to point to the local tunnel 1 interface IP address (not the tunnel source address), and the SIP server for the local phones would need to be configured for the local voice vlan IP address.
Thanks,
Matt