Understanding Caller ID in SIP INVITE: SIP Headers Explained

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

Troubleshooting Delayed Ringing Issues on Grandstream HT8X1 and UCM63XX

Troubleshooting Delayed Ringing Issues on HT8X1 and UCM63XX

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

Inbound Calls to DID Fail Due to Incorrect Configuration of DID Mode in Grandstream PBX UCM63xx

Grandstream PBX 404 Not Found Inbound Calls to DID Fail Due to Incorrect Configuration of DID Mode

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

Account Registration Failed in Grandstream Wave Mobile with UCM Remote Connect Address

Account Registration Failed Grandstream Wave Mobile with UCM Remote Connect services

Description This article describes the error of Account Registration Failed when logging in to Grandstream Wave Mobile using the UCM Remote Connect address, but it works in Wave Desktop and Wave Web. The error occurs when an invalid certificate is uploaded. Try these 2. Go to UCM’s UI > PBX settings > SIP Settings > … Read more

Ring Simultaneously on Grandstream IP PBX UCM & Panasonic Analog PBX’s Extensions

Description This article describes the steps to configure Ring Simultaneously on the same extension range of Grandstream IP PBX UCM63XX and Analog PBX. Scenario I have an extension range (200-300) in Panasonic Analog PBX and Grandstream PBX UCM6301. They connect with a PRI Gateway GXW4501 through a SIP Peer Trunk and E1 cable. When someone … Read more

FAQs: Deployment Scenarios and Case Studies for Grandstream IP PBX UCM6XXX

Grandstream IP PBX UCM6XXX Deployment Scenario
Q1. The customer has an ISDN PRI number 5600300 with 30 channels, numbers from 5600300 to 5600329. They have multiple company headquarters located in one building and want to have one primary for 3 companies. Each company has a different IVR answering the call and a dedicated number for fax.  This can be done using the DID ... Read more

No Ringback Tone when making outbound calls with Grandstream IP PBX UCM63XX

No Ring Back Tone when making outbound calls with Grandstream IP PBX UCM63XX

Description No ‘ringback tone’ issue on outbound calls occurs when the PBX or UCM receives 183 Session Progress (with SDP) first and then 180 Ringing later from the SIP Service Provider (ITSP). It would be a 183 Session Progress message to play the ‘Early Media’ on the caller’s phone. Also, missing SDP in 183 Session … Read more

Grandstream UCM Remote Connect (UCMRC) Strict RTP causes no audio between IP Phones

Strict RTP Grandstream UCMRC Remote Connect

Scenario There is no audio issue in the calls between IP Phones using UCMRC. However, audio works when the call is established between the Wave app and the IP Phone with the same registered extension. Solution The “Strict RTP” option cannot be enabled while using the remote domain address of UCMRC services. When using the … Read more