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

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

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

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

Description This article explains the 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 Packet capture Outbound CID Priority TO vs Request Headers The Request-Line and To headers show the DID used by the PBX, eg. 8887771234 is the DID, it is … 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

Common Analog Trunk issues in Grandstream UCM63XX/62XX/6510

Description This article outlines common Analog and PSTN trunk issues encountered with Grandstream IP PBX UCM63XX/62XX/6510. It provides a list of suggestions to address various scenarios in customer setups. Issue 1: Noise or Echo Issue 2: Caller ID Not Showing or Displayed as 0000 Issue 3: FXO Port Status Not Displayed Correctly in Web Interface … Read more

Grandstream UCMs Peering with Least Cost Routing

Least Cost Routing Grandstream UCM

Scenario I have two UCM62XXs at two locations with different extension number ranges:Location A: UCM6204 (extension range 1000) Location B: UCM6204 (extension range 2000). There is a VoIP Trunk connected in UCM A. Is it possible to make outbound calls from UCM B through UCM A’s VoIP Trunk and vice versa? How-to Inbound call The Service Provider has given the … Read more

Grandstream IP PBX UCM’s Outbound Routes Dial Plan Pattern for Australia

Outbound Route Dial Plan UCM

Description This article describes the sample of the Outbound Routes Dial Plan for Australia in Grandstream UCM. Outbound Route Dial Plan Pattern Local _XXXXXXXX (this allows you to dial a local number like 9411 0000) Mobile _04XXXXXXXX (this allows you to dial a mobile number like 0413 431 000) National _[2-9]XXXXXXXXX (this allows you to … Read more