Yes, you could go to GXP phone’s Web GUI -> Settings -> LCD Display -> Wallpaper to load your customized wallpaper file. There are 3 ways to load wallpaper file. One of them is setting “Wallpaper source” to “Download” and entering your file server path to “Wallpaper Server Path”. When rebooting, phone will look for wallpaper.jpg or wallpaper.jpeg from the file server. You could also upload wallpaper from local directory or USB root directory. To learn more details, please read phones’ Administration Guide: http://www.grandstream.com/index.php/products/ip-voice-telephony/enterprise-ip-phones/gxp2130. Note: The Wallpaper Server Path must be TFTP, HTTP or HTTPs. Without specified, phone will assume it is HTTP.

Besides using the config tool and config template to generate the config file, users could also provision the GXP2130/GXP2140/GXP2160 using XML format file. Users will need to create an XML file cfgxxxxxxxxxxxx.xml (where xxxxxxxxxxxx is the MAC address of the phone) using the P values in the config template. For the XML example configuration file, please refer to the document in this link

There are two ways to turn on/off DND on GXP2130/GXP2140/GXP2160:
1. On GXP phone LCD menu -> Preference, highlight “Do Not Disturb” option and select “Enable DND” or “Disable DND” by pressing left/right arrow key.
2. On GXP2130/GXP2140/GXP216 Web GUI -> Settings -> Call Features, set option “Mute Key Functions While Idle” to “DND” and click “Save and Apply”. Then go to GXP phone’s keypad and press MUTE key to enable/disable DND.

You will need to configure a "eventlist BLF" URI on your server side if the server supports it. (i.e.: BLF1006@myserver.com)
1. On GXP phone Web GUI -> Account X -> SIP Settings -> Advanced Features, fill in the "eventlist BLF URI" field with the URI without the domain. (i.e.: BLF1006).
2. On Web GUI Settings-> Programmable Keys-> Line Keys X or Multi Purpose Key X, select "eventlist BLF" for the Key Mode and specify Account, Description and Value.

Since Release 1.0.2.9, GXP2130/GXP2140/GXP2160 support following Keypad shortcuts:
1. UP: in idle screen, press UP arrow key to check your phone’s IP.
2. HOLD + RIGHT: When phone is in idle screen, press HOLD button followed with RIGHT arrow key to trigger phone provisioning process.
3. HOLD + LEFT: When phone is in idle screen, press HOLD button followed with LEFT arrow key to trigger firmware upgrade process.

Users can use GXP2140/GXP2160 for the following applications via Bluetooth: - Bluetooth headset for communication, wireless control including answering call and hanging up call; - Pairing and connection with mobile phone; - Import mobile phone contacts; Note: The original GA 1.0.1.6 build only supports connecting to Bluetooth Headsets. The current Beta 1.0.2.9 supports both connecting to Bluetooth Headsets and Bluetooth Phones (one at a time).

GXP2140/GXP2160 supports Bluetooth Class 2, i.e,:
- Maximum permitted power: 2.5 mW, 4 dBm
- Range: ~10 m

No, mobile phone cannot act as Bluetooth headset role. When your mobile phone is connected with GXP2140/2160 via Bluetooth hands free mode, you can answer/terminate the mobile phone’s incoming call on GXP phone. Note: The original GA 1.0.1.6 build only supports connecting to Bluetooth Headsets. The current Beta 1.0.2.9 supports both connecting to Bluetooth Headsets and Bluetooth Phones (one at a time).

Being that VoIP devices are running over an IP network, we find that these devices become more vulnerable to attacks. Whether it be a denial of service or an attempt to use your services without you even being notified. In cases where you receive phantom calls from random extensions that do not belong to your softswitch, may point to an automated scanner, which seek out gateways in attempt to make free calls as the owners expense.

If this is occurring on your SIP Gateway, it is recommended that do not forward port 5060 on your router, but to use a unconventional SIP port.

If this is occurring on a Grandstream IP phone, users have the ability to deny calls that are not authenticated. On a GXP2130/40/60 you can find the option by navigating the the web interface, clicking on Account X-->SIP Settings-->Security Settings and enabling "Authenticate Incoming invite"