Description Slowness in IP phones can be attributed to various factors. This article suggests the troubleshooting steps to address slowness and sluggish issues in Grandstream GRP2612 or GRP2613 IP Phones: 1. Disable CPE (TR-069) under System Settings 2. Disable ‘Send SIP Logs’ and ‘Auto Recovery from Abnormality’ under Maintenance > System Diagnostics > Syslog 3. … Read more
Description This article briefly describes the Security Settings parameter in Grandstream IP Phones GRP261x series. It is important for debugging when the phones are registered via TLS/SSL. ‘Validate Server Certificates‘ is mainly used for Web Interface or SSH access. ‘Check Domain Certificates‘ is to check a domain using the Trusted Domain Name List. ‘SSLKeyLogFile‘ is … Read more
Description This article describes the troubleshooting steps to workaround the upgrade failure in the Grandstream GBX20 Extension module version 1.0.0.1. By default, the GBX20 firmware is upgraded by direct network download through the host phone (eg GXV3350 or GRP2615)’s network connection and GXV3350’s firmware upgrade setup. Ensure that you set firmware.grandstream.com on the GRP2615 Web … Read more
Description The Grandstream GXP16xx supports XML-based idle screen customization. This XML API allows users to customize the idle screen layout as well as the logo, text, or system variables to be displayed. The design of the display and layout depends highly upon personal preferences and requirements. The document below specifies the Grandstream XML Customizable Screen … Read more
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Description In an IP phone system, audio delay can occur due to network latency, jitter, and packet loss. In addition, audio codecs and processing that are used in IP phone systems can also contribute to audio delay. To reduce audio delay in IP phones, network administrators can use Quality of Service (QoS) techniques to prioritize … Read more
Description This article describes the steps to troubleshoot the Grandstream IP Phones that are stuck at ‘Recovery Incomplete’ or ‘Firmware Initialising’ upon boot up. This is commonly found in GXP16XX series IP Phones – GXP1610, GXP1620, GXP1625, GXP1628 and GXP1630. Cause The error is caused by power failure or disruption during a firmware upgrade or … Read more
Description This article describes Grandstream Android Phone GXV32XX as being not responsive when receiving incoming calls. The users are unable to answer or pick up calls from the LCD call screen. This scenario is seen after UCM firmware upgrade. Workaround Please try one of these methods: a. Go to UCM63XX’s WEB UI > Extension > Media > … Read more
Description Ghost calls will usually affect the phone level. You may find it annoying by getting authorized calls. You can increase the security on the affected phone by setting the following parameter to YES in Grandstream IP Phones – GXP16XX/17XX/21XX and HT8XX ATAs models. Validate Incoming Messages Check SIP User ID for Incoming INVITE Accept … Read more
Description Upgrading the product to the latest firmware version allows the expiration date of Grandstream-authorized certificates to be adjusted automatically. Even with the certificate expired, the communication between the phones and clients might not be secure or fully encrypted but the device will still function. Downloads GEN 1 (SHA256) GEN 2 (SHA384)