Masquerade NAT Implemenatation in some routers exposes Phone/ATA signaling port to the internet : _

Masquerade NAT Implemenatation in some routers exposes Phone/ATA signaling port to the internet Print

Modified on: Fri, 1 Jul, 2016 at 2:13 PM

This can cause the SIP device to appear to ring at times, yet there are no calls originating on the Strategic Voice Solutions network.

This issue can arise when a Masquerading NAT device does not masquerade the phone/ATA SIP port number and instead listens on its public interface on the native port of the SIP device connected to the private interface of the NAT/router. In some cases, hackers may detect the phone responding to SIP invites and may send a large volume of calls in an attempt to break into what appears to be a SIP server. There is little security risk in this situation. The simplest way to resolve the issue is to change the default port number the phone/ATA listens on to a port that is not well known for SIP. An example would be to change 5060 to 5555.

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Masquerade NAT Implemenatation in some routers exposes Phone/ATA signaling port to the internet Print

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