SIP trunk at SBC side

[technotux]

I need help with configuration of the following scenario

Site A:
1) 3CX V20 Installed on Hyper-V, All local IP phones are connected through LAN and Site B IP Phones are connected through 3CX SBC Installed at Site B
2) Site A SIP trunk is delivered by SIP Service provider over private network due to compliance issues of VOIP over the internet in India

Site B:
1) 3CX SBC Installed on Windows Server 2019 Hyper-V as VM, All local phones of Site B are connected through this SBC to 3CX V20 PBX at Site A
2) Site B SIP trunk over private network due to compliance issues of VOIP over internet in India
3) Having Sophos XGS116 Firewall with Static IP

Requirement: As 3CX SBC doesn't support the integration of trunk within SBC, how can i add trunk of Site B to Site A 3CX V20 PBX, Is SIP trunk is delivered on private network at both ends with separate ethernet connection What are the best options i have to connect Site B trunk to Site A 3CX V20 PBX

 

[SteveITS]

You could set up a second server and bridge them. Removing the SBC.

 

[technotux]

Setting up second server is not a option because customer want to manage it centrally using single 16SC license….

 

[NicholasP_3CX]

Just VPN the 2 sites together, and have everything connect locally within the network. You will even get ride of the need for the SBC.

 

[technotux]

Connecting through VPN is also not feasible solution as trunk is terminated to Site B over private network and service provider not supports VPN…

Is there any Open Source SIP Proxy i can use ? i can deploy VM at site B

 

[NicholasP_3CX]

The SIP Trunks can only be terminated on a 3CX PBX. Your choice is either a PBX at each site, or having the provider devices connect over a VPN. You wouldnt need the provider to do this. You could do this yourself with your own networking devices.