3CX includes the 3CX Session Border Controller (SBC) which allows easier bridging of remote instances and connection of remote extensions. The SBC allows the 3CX tunnel to deploy all phone communications from the 3CX PBX over a single port locally and splits the call out inside the firewall. 3CX’s Tunnel handling of VoIP traffic is more seamless and less problematic than other IP PBX solutions.
The 3CX SBC combines all SIP (signaling) and RTP (media) VoIP Packets from one location and delivers them to and from another location (typically the PBX Server) using a custom TCP protocol. This simple concept allows 3CX to overcome firewall or telecom provider issues. The 3CX SBC can also be used for the following reasons:
Resolve issues of NAT Traversal at both the remote and the PBX location.
Simplified Firewall configuration at both the remote and the PBX location.
Overcome difficulties with ISPs that block VoIP Traffic based on port numbers.
Allows VoIP-over-WiFi in some restricted locations, such as Hotel rooms.
“Fixes” Firewalls that cannot handle VoIP traffic correctly or which are very problematic to configure correctly, such as Microsoft ISA Server
The 3CX SBC is suitable for sites with multiple IP phones in the same LAN. After configuring the SBC connection in 3CX “Management Console” > “SIP Trunks”, follow the SBC Installation Guide to install the SBC at the remote site for Debian, Raspbian and Windows.
If you need assistance with your SBC or need further information about 3CX’s tunneling for cloud hosted PBX, email us at: help@covecentral.com