HA Configuration Network Topology in Grandstream IP PBX UCM

Network Topology HA in switch mode Grandstream IP PBX UCM

Description Starting 1.0.23.x, Grandstream IP PBX UCM supports High Availability (HA) in Route mode. This article describes an example network diagram of HA in Route and Switch mode. HA in Route Mode The full user guide can be found under HA Configuration Using “Route” Mode section. The steps describe the topology below: HA in Switch … Read more

Slowness issue in Grandstream IP Phone GRP261x series

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

Understanding the Certificates Security Settings in Grandstream IP Phones GRP261x series

Understanding Security Settings in Grandstream IP Phones GRP261X

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

Grandstream GBX20 Extension Module Firmware Upgrade Failure

Grandstream GBX20 Firmware Upgrade

Description This article describes the troubleshooting steps to workaround the upgrade failure in the Grandstream GBX20 Extension module version By default, the GBX20 firmware is upgraded by direct network download through the host phone (for eg GXV3350 or GRP2615)’s network connection and GXV3350’s firmware upgrade setup. Make sure you set firmware.grandstream.com on the GRP2615 … Read more

XML-Based Idle Screen Customization Guide for Grandstream GXP16XX Phone

XML Based Idle Screen Customization Guide for Grandstream GXP16XX Phone

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

Grandstream IP PBX UCM Data Partition is Full

Grandstream IP PBX UCM Full Data Partition

Description This article describes the best practices to free up the data partition in Grandstream IP PBX UCM to avoid abnormal behaviors such as call drops, delays, and slow performance. The UCM62XX or UCM6510 series has a config partition of only 200MB while the UCM630X series has a 500MB config partition. The data partition is … Read more

Grandstream UCM6510 and HA100 connection sample diagram


Description The Grandstream HA100 is a high availability IP PBX solution designed for small to medium-sized businesses. It allows for the creation of a redundant system with two Grandstream PBX UCM6510 that can automatically switch over to a secondary system in case of a primary system failure. It also supports automatic failover for SIP trunks … Read more

Grandstream IP PBX UCM – Completion Request / Busy Camp-On

Grandstream Call Completion Busy Camp on

Description This article illustrates the scenario when the caller requests Call Completion when called party is busy with Grandstream IP PBX UCM6XXX. You may refer to the complete guide here. By default, when the Call Waiting feature is disabled at the Extensions and IP Phones, the Call Completion request works only on unanswered or timeout … Read more

Grandstream Android Phone GXV32XX is not responsive when receiving incoming calls

Grandstream GXV32XX is not responsive in answering calls

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