The SIP protocol is commonly used for IP telephone communications. Unfortunately it’s notorious for having issues with NAT traversal. Even some major vendors can’t seem to get it right. [Stephen] had ...

Whether it's for firewalls or Virtual Private Networks, we're seeing an increasing emphasis on VoIP Security. The point was hammered home today by a look at the Security Appliances winner in ...

I've never needed to do this with a network that had an ASA, but have done it with a Sonicwall. When setting up a FreePBX server behind a Sonicwall I needed to do the following: - Turn on Consistent ...

The firewall has 5060 and 10000-20000 open to the SIP provider (voip.ms), and a static NAT to the FreePBX server but we are getting some set of calls with no audio on either end. Anyone have any ideas ...

A bug in a Realtek software development kit (SDK) means any third party devices with software that uses the SDK could inherit a vulnerability in their Session Initiation Protocol (SIP) implementations ...