The SIP Proxy Tunnel can combine all SIP (signaling) and RTP (media) VoIP Packets from one location (typically a remote office) and deliver them to and from another location (typically the PBX Server) using a custom TCP protocol. This simple concept allows us to exploit the SIP Proxy Tunnel to overcome difficult situations, or to simplify a network scenario.
The SIP Proxy Tunnel can be used for the following reasons:
- Resolve issues of NAT Traversal at both the remote and the PBX location
- Simplify 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 difficult or problematic to configure correctly, such as:
- Microsoft ISA Server
- SonicWall
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