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 ...

To "prove" that ALG is off, target a host on a public IP with your SIP client, and run a packet capture there. In the "Contact: <sip:[email protected]>;expires=3600" line of the registration ...

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 ...

No one likes choppy audio or dropped calls. Use these simple VoIP troubleshooting tactics for crystal clear internet calls every time. Making VoIP (Voice over Internet Protocol) calls is easy, ...

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Das Problem dabei ist, dass es dabei immer wieder dazu kommt, dass SIP-Pakete falsch umgeändert werden oder dass eine vorher erstellte UDP-Verbindung plötzlich ins Leere führt. Ein Symptom dafür ist ...