How to Get Syslog and Ethernet Packets from Grandstream Devices (using Wireshark)

Description If you are new to telephony networking and troubleshooting, this guide shows you step-by-step in setup and configuring the parameters to capture the packets locally in Grandstream devices. When we run into telephony issues (for eg. no audio, BLF keys are not working, unable to make calls, etc), in order to have the Support … Read more

SFP Modules for Grandstream Network Layer 2+ Managed Switches GWN780X(P) Series

SFP Module Grandstream Network Switches

Description SFP (Small Form-factor Pluggable) is a type of transceiver used in networking to connect a device, such as a router or switch, to a network. It is a small, hot-swappable module that sits inside a device and allows it to connect to different types of networks, such as Ethernet, Fibre Channel, or SONET. SFPs … Read more

Audio delay issue due to Codec Setting in Grandstream IP Phones GRP26XX

Audio delay in Grandstream IP Phone

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

Grandstream Wave Mobile Application – Account Registration Failed

Description When Grandstream IP PBX UCM63XX is used in remote work without Remote Connect service (UCMRC), there are certain network settings required to allow Grandstream Wave Mobile application login via UCM’s Public IP addresses; otherwise, you will get login errors such as ‘Account Registration Failed’ or ‘Unable to connect to the server’. Configure the ports … 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

Default Ports in Grandstream Networking GWN Access Points, Routers, and Switches


Description This article describes the usage of the default ports in Grandstream Networking GWN76XX access points, GWN70XX routers, and GWN78XX network switches. Wifi Access Points Ports Description 22 SSH 67 DHCP 53 DNS 5353 MDNS 80 or 443 LLMNR 8080 or 8443 Web Portal 9443 Vouchers Authentication 14 or 10014 GWN Manager 223 Mesh 224 … Read more

Phones are stuck at ‘Recovery Incomplete’

Recovery Incomplete Grandstream IP Phones GXP1625

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

Ports required for IPVideoTalk in a closed network

IPVideoTalk Open Ports

Description This article describes the list of ports required to setup IPVideoTalk in a closed network: Web home page & Web account portal  WebRTC  GVC32XX need config 

Grandstream ATA HT8XX in Bridge Mode

Bridge mode ATA Grandstream-2

Description This article describes the behavior when Grandstream Analog Telephone Adapter (ATA) is set in Bridge mode. When the ATA HT8XX series is configured in Bridge mode, the devices connected to its LAN port will behave similarly to any devices connected to a switch; they will obtain the IP addresses from the DHCP server and … Read more

Ports Required for H.323 Video Call in Grandstream GVC32XX

H.323 Ports for GVC32XX

Description This article describes the list of ports required for H.323 video calls in Grandstream Conferencing GVC32XX. 389 statique – TCP ILS Registration (LDAP)   1503 statique – TCP T120   1718 statique – TCP Gatekeeper Discovery   1719 statique – UDP Gatekeeper RAS   1720 statique – TCP H323 Call Setup   1731 statique – TCP Audio Call Control   … Read more