Distinctive Ringing for Internal Extensions with 3CX and Yealink

Mark Berry April 19, 2017

A customer using 3CX v.15 with Yealink T42S phones would like calls from internal extensions to have a distinctive ring.

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Disable SIP ALG on Tomato Shibby

Mark Berry March 16, 2017

A PBX vendor like 3CX may tell you to disable SIP ALG on your router.

I’m running Tomato on my router, specifically Tomato Firmware 1.28.0000 MIPSR2-132 K26 Max. With the help of this thread, I checked and disabled SIP ALG.

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3CX SBC Invalid signature received: 0x10317

Mark Berry February 23, 2017

I’m using 3CX Session Border Controller (SBC) 15.0.56341 to connect to a 3CX v15 SP4 server running on Server 2012 R2 in the cloud. Usually it works fine. A couple days ago, though, even after re-starting the SBC, I was getting the error "Invalid signature received: 0x10317".

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3CX 15 Tunnel Not Listening

Mark Berry January 13, 2017

TL;DR If your 3CXPhone app and/or your desktop phone are not able to connect to a remote 3CX server, test connectivity to the server on 3CX tunnel port 5090. If there’s no connection, on the server, check if anything is listening on that port. If not, restart the 3CX SIP/RTP Tunneling Service.

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3CX 15 Upgrade Notes and Gotchas

Mark Berry October 28, 2016

I’m doing a test upgrade on a local Windows 2008 R2 server from 3CX 14 to 3CX 15. A few notes and gotchas for future reference. Read these before uninstalling 3CX 14! There are several bits of information, including the 3CX 14 configuration backup, that will be lost if you follow 3CX’s instructions. Perhaps these notes will help 3CX improve the documentation and the install experience.

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3CX Modifies Windows Hosts File

Mark Berry August 4, 2016

A Windows Server 2012R2 Essentials machine was returning strange results when I did a DNS query from PowerShell. I traced it back to modifications that 3CX version 14 had made to the Windows hosts file.

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Outbound Calls Busy through 3CX Session Border Controller

Mark Berry July 26, 2016

I am running 3CX 14 stand-alone on a cloud-based server with a fixed IP.

At my location, I have installed the Session Border Controller (SBC), also v14, on a local server.

When I dial out from a local phone, sometimes I just get a busy signal, even if I am dialing ext. 99 for voicemail. Running a trace on the phone, I see it is receiving a 403 Forbidden error.

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3CX Custom Provisioning Templates

Mark Berry June 6, 2016

If you want to provision unsupported phones to use with 3CX, you may come across this article on the 3CX web site:  Provisioning unsupported IP phones. It looks quite helpful but it’s out of date in an important area:  the location of the templates.

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