Private Link for SIP Trunking on the SDWAN Router.

[AdrianKumar96345]

Hello Everyone

We are currently having 1 * Carrier in the VPN 0 (G0/0/0) whilst the Clients are in VPN 20. We want to connect Private SIP Trunks to the network and requesting for your advise if the approach below is fine.

1. Connect the Private SIP Trunk Link to the Port G0/0/3 in VPN 20.

 G0/0/3 IP address 10.10.10.2/30----------------Carrier CPE Device (10.10.10.1)
2. Configure a static route through the CLI template

ip route 172.16.100.100 255.255.255.0 10.10.10.1

Route to the Carrier SBC via the Carrier CPE Device

3. Enable NAT on the G0/0/3 interface

Requesting for your advise if the above configuration

Regards

Ad.

[Kanan Huseynli]

Hi,

can you give detailed information a bit what you are trying to archive?

[AdrianKumar96345]

Thanks a lot Kanan

Basically, we are trying to achieve the following:
1. The site uses Hard Phones and Soft Phones on PCs and Mobiles. This is already working.

2. The PCs and Smart Phones for all the internet traffic will be routed off the G0/0/0 - ISP Link in VPN 0. This is already working.

3. The Desk Phones and Soft Phones on PCs and Mobiles is on VPN 20. This is already working.

4. The Desk Phones and Soft Phones on PCs and Mobiles will dial put through the Private SIP Trunk. The Private SIP Trunk to be connected to the G0/0/3 Port of the Router in VPN 20. This is where I am not able to figure out.

Please if you can advice.

Regards

Ad.

[Kanan Huseynli]

Hi,

I don't have much more experience with IPT, but since SIP trunk terminated port (g0/0/3) and phones connection are in the same VRF (VPN 20), you should not need anything other than routing.

Do phones need to be NATed for proper connectivity? ISP should see phones with mapped IP or with real IP? If mapped IP should be (which is most probably from g0/0/3 subnet range), then yes you need NAT (which is called service-side NAT).

You may also refer similar scenario (service-side intra VPN NAT on he same sd-wan router):

https://community.cisco.com/t5/sd-wan-and-cloud-networking/sd-wan-intra-vpn-service-side-nat/td-p/4817743