Remote Office Location connect phone via VPN - Avaya

Set your public IP and local networks, including VPN network 10.x.x.x.x in SIP settings and try again. VPN network should be set as local network. Make a SIP-based VoIP network more secure - TechRepublic Jan 05, 2007 Solved - SIP Provider through VPN | 3CX - Software Based

Navigate to Manage | VPN | Settings and Configure the VPN policy for the VoIP traffic. Under the Advanced tab, check the option for Disable IPSec Anti-Replay Also Please ensure all VoIP Traffic flows over a single WAN Interface if you have multiple WAN connections available on the Network.

Problems with VoIP/SIP Connection over IPsec VPN — Zyxel

How to pass SIP calls over OpenVPN Tunnel - OpenVPN

Set your public IP and local networks, including VPN network 10.x.x.x.x in SIP settings and try again. VPN network should be set as local network. Make a SIP-based VoIP network more secure - TechRepublic Jan 05, 2007 Solved - SIP Provider through VPN | 3CX - Software Based