3CX VoIP PBX - Grandstream GXW4104 Config Issues

Justin
Justin used Ask the Experts™
on
Hello,

I am a beginner with 3CX, and unfortunately I'm having issues configuring my new Grandstream GXW4104 gateway. I can get outbound calls to work, but for the life of me I can't figure out how to get the inbound calls to work properly. I've spent 2 days trying different things, tried several configuration guides, read the forums, been all over the internet, but nothing seems to work. I did have 1 successful inbound call routed to an extension (immediately after completing a re-configuration), but was unable to make a 2nd inbound call - it just rings out.

Strangely, after a standard configuration (as per the 3CX guide), with no inbound rules, inbound calls will consistently go to the operator, which is by default sent to voicemail, as I have no phone set up for that extension. If I then create an inbound rule or change any settings, no inbound calls come through. Changing the settings back to how they were also results in no inbound calls! I can only get it to work again by doing the gateway configuration from scratch!

Apart from the situation above, looking at the 3CX activity logs shows no activity when an inbound call is placed (log set to Verbose). Within the GXW4104 web interface, it shows that the line has a call coming through, yet 3CX reports nothing. I have set up the syslog server in the GXW4104, and from my untrained eye, when a call comes in, it is spitting out heaps of data, yet 3CX activity shows nothing. The gateway status always has a green light next to it.

I have also been noticing some strange things. As an example, when I set the DID numbers in the gateway setup of 3CX and the configuration is provisioned to the gateway, the user ID's for the forwarding in the GXW4104 itself don't match the DID's... I've tried to provision the gateway with matching DID's, and even manually adjusting the config in the GXW4104, but still don't have any success.

I have had no issues accessing the 3CX interface, provisioning the Yeahlink T48G and W60B/W56H phones. The 3CX server is the Debian ISO, installed as a Hyper-V guest on Server 2019. The VoIP network is a standalone VLAN - server, gateway and phones all on the same VLAN. Server and gateway both have static IP's. I have played around with turning the firewall off - but not extensively (not sure how the firewall would cause this issue, but I'm trying anyway).

Does anyone have any ideas on where I should be looking?

Thanks in advance.
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AlanConsultant

Commented:
Hi Justin,

When I have any questions regarding 3CX, I normally post them on the 3CX forum:

https://www.3cx.com/community/

Whilst you might get people here seeing and helping, everyone over there is a (relative) expert in 3CX, so the quantity and quality of answers will generally be better.

Hope that helps,

Alan.

Author

Commented:
Hi Alan,

Thanks for the comment.

Yes I have also posted on the 3CX forums, but I've noticed a bit of a trend over there with this particular gateway - a considerable amount of unanswered or abandoned questions. I was hoping that posting here might increase my chance of getting a resolution.

Thanks,

Justin
Distinguished Expert 2018

Commented:
Honestly, the 3CX forums didn't hold much value for me in cases like that. I found it more worthwhile to contact their support (not sure if you have support from them or from a reseller). I had a lot of trouble with a Patton gateway (having followed 3CX's own documentation), which they sorted out in 5 minutes (granted, they did all of the programming for me). Only downside was they didn't really explain out what they ended up doing, but I remember the support person went on the CLI.
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AlanConsultant

Commented:
Hi Justin,

Is the 3CX passing the firewall tests 100%?

Thanks,

Alan.

Author

Commented:
Hi masnrock,

Yeah that is what I am seeing also. I was about to contact #CXsupport, but Grandstream themselves came through with the goods. They were quick and to the point, and provided me a firmware with a revision that is not publicly available. In summary: the gateway was the issue. You can read more about it here:

https://www.3cx.com/community/threads/grandstream-gxw4104-configuration-issues.66847/



Hello again Alan,

My 3CX is generally unhappy with the firewall (red ! -  because it can't reach the outside world), but during testing, I had everything disabled. As mentioned above, it seems that it was the gateway causing the issue.
Commented:
Turns out there was an issue with the gateway. A firmware provided by Grandstream sorted the issue.

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