A common scenario for receptionist phones is having the ability to perform a one button transfer to an external number (i.e. transferring a call to the on call mechanic). Step 1: Configure a MPK/VPK button as type 'Speed Dial via Active Account' and set the external number you want the call to be transferred to (Settings > Programmable Key...

Occasionally we receive phone calls in regard to Ghost Calls, with the Grandstream ATA Adapters and any other SIP Based Grandstream Product. This is typically prevented by making the following changes in the settings:   Validate Incoming SIP Messages. Set to YES for security reasons. This alone can prevent ghost calls! Check SIP UserID for...

There are many ways to upgrade your Grandstream device firmware. DHCP Option 66 is a great way to upgrade Grandstream device firmware (and many other brands) without having to login to the devices web interface and manually set the firmware server path. This allows you to upgrade Grandstream device firmware automatically from an out of the box ...

Scenario This article will explain how to identify SIP registration issues using a the built in packet capture function found on most Grandstream devices.   Step 1: Login to your device and start the packet capture (in this example we will perform a packet capture from a UCM6202):   Step 2: Initiate a registration request from an IP Ph...