Grandstream UCM6510 and HA100 connection sample diagram

HA-connections-UCM6510-front

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

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

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

Understanding PPI mode: DOD Number when Call Forward to External Number

Description This article explains P-Preferred-Identity (PPI) Header in UCM’s INVITE message when UCM forwards the call from the extension to an external or mobile number. Test Steps Configure a VoIP Trunk Go to Advanced Setting and enable Send PPI Header and set PPI Mode to ‘DOD Number’ Configure DOD number: ddd9955 and DOD Name: DDD9955 at … Read more

Forward Original Caller ID in Grandstream IP PBX UCM

Grandstream Forward Original Caller ID

Description Call forward makes the remote working solutions more efficient and ensures continuity of business operation. This article describes the settings required to allow the forwarding of the original Caller ID of external numbers in Grandstream IP PBX UCM. 1. Make sure that the UCM has the latest firmware version 2. Make sure the following settings … Read more

How to Block Ghost Calls on Grandstream IP Phones

How to Block Ghost Calls on the Phones

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

How to Enable SFTP Data Sync in Grandstream UCM with MAC OS

MAC OS SFTP UCM Data Syncing

Description This article describes the configuration steps on how to enable SFTP Data Sync in Grandstream IP PBX UCM with MAC OS. Step 1: Follow this guide to enable SFTP and allow File Sharing in your Macbook Step 2 Navigate to UCM’s Web UI > Maintenance > Backup > Data Sync and enter SFTP’s Administrator … Read more

How to use Security Certificates on IP Phones – Grandstream GXP16XX/17XX/21XX

CA SSL Grandstream IP Phones

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 as normal. Downloads

Attended Transfer Call Flow

Attended Transfer Grandstream GXP2135

Description This article describes the call flow of Attended Transfer initiated by Grandstream GXP2135. VoIP packets and the phone’s Syslog messages will be discussed in this article. Call Flow a. Ext. 1001 dials Ext. 1007 b. Ext. 1007 puts the call on hold with ext. 1001 by pressing the Attn Transfer button on the Call … Read more