One of the many benefits of employing SIP with an Ingate device is using Remote SIP Connectivity – which allows employees to leverage the SIP capabilities of the corporate IP-PBX while working from any remote location (home, satellite offices, etc.) as long as there is a connection to the Internet.

This is possible without the need to upgrade the remote user’s network to support SIP, or to implement VPN tunnels from the remote site to the central location of the company. Essentially the remote user can be “tied in” to the SIP capabilities of the main network without having to purchase additional hardware or software for the remote site.

With this feature, employees can use the company IP-PBX as if they were collocated with it. This means remote workers can utilize SIP trunking or VoIP, IM, realtime videochatting and more for less cost than using a cell phone or having a separate business line at their home office. There are also productivity benefits to utilizing the many presence applications with SIP.

For example: an employee “on the road” can make phone calls to colleagues inside the LAN as well as sales prospects outside the LAN by using SIP, instead of a cell phone. Remote SIP Connectivity can also revitalize Internet-based support services with the immediacy of “click to talk” features.

Ingate’s Remote SIP Connectivity software module is installed on the centralized Ingate SIParator or Firewall. The Ingate can support many remote users and as many remote sessions as is permitted by the number of traversal licenses installed on the Ingate unit.

The Ingate resolves NAT traversal issues both at the enterprise edge and at the remote site. Resolution of the problem at the remote site requires only that far-end NAT traversal be enabled on the Ingate.

Remote SIP Connectivity includes a STUN server to support STUN clients, if available. Far-end NAT traversal is used when a STUN client is not available, or if the remote user is behind a symmetric NAT. With Remote SIP Connectivity enabled, the Ingate unit negotiates through the far-end NAT device and keeps a pinhole open as long as the client is registered. This controlled NAT traversal provides superior security benefits to alternative solutions.

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