Understanding SIP and RTP in Asterisk In a standard VoIP setup, SIP is used for signaling—establishing, managing, and terminating the call. Once the call is established, RTP (Real-Time Transport Protocol) carries the actual voice media. By default, Asterisk can either relay the media (RTP flows through Asterisk) or allow direct media, where RTP flows peer-to-peer … Read more
Description To ensure a smooth synchronization of your Google Contacts with the Grandstream GXV3480 video phone, follow these steps: Automatic Sync Setup (Android) Manual Upload Method Follow these steps to manually upload your contacts:
Description The GRP260X may fail to boot and get stuck at the Grandstream logo. The latest firmware version (1.0.7.11) resolves this issue. Recovery Methods How to check the phone’s IP address There are two methods to check the phone’s IP address:
Description Caller ID Number (CID) is a telecommunications feature that provides the recipient of an outbound call with the phone number of the caller. When you make a call, this service transmits your phone number, allowing the callees to see who is calling before they answer. This feature enhances communication by enabling callee to screen … Read more
Description Delayed ringing can be a frustrating issue. There is a delay of 12 to 17 seconds for inbound calls to connect from the PSTN to IP phones via the Grandstream FXO gateway HT8X1 and the IP PBX UCM63XX. In this article, we’ll explore some common causes of delayed ringing and provide troubleshooting tips to … Read more
Description When the Inbound Route’s Pattern is specified using a Direct Inbound Dialing (DID) number or the format _03x, the call fails with a prompt ‘The number you have dialed is invalid, please try again later.’ resulting in a 404 Not Found error returned by the Grandstream IP PBX UCM. Analysis Please enable UCM’s Syslog … Read more
If you encounter issues such as frequent disconnections or cannot obtain an IP address on the Grandstream FXS Gateway GXW42XX series, here are the steps for diagnosing hardware defects in the network port: If the above steps do not resolve the issue, please contact the Support team for further assistance.
Description We are currently experiencing intermittent unresponsive events with the Grandstream GXW42xx FXS gateways. In the most recent incident, while the gateways were responsive to pings, users could not log in. This required the customer to manually power off the gateways for 2-3 minutes before they resumed normal functionality. It’s worth noting that there is … Read more
Description When uploading the firmware file to the Grandstream GXW42XX FXS gateway, you may encounter the error: “Unable to upload the file. Please try again. Reason: CGI Error.” How-to This error typically occurs when the incorrect firmware file is uploaded. The GXW42xx V2 device requires a different firmware file than the GXW42xx V1 device. Please … Read more
This article addresses the video call establishment issue encountered with Grandstream Android IP Video Phones GXV3XXX when used with the Mitel MiVoice 3300 system. Users may receive a “Video Invitation Failed” error during calls. This issue can be resolved by adjusting the SIP Options and Signaling Header Manipulation settings under the Mitel system’s SIP Device … Read more