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VoIP

Screenshot 2024-10-27 002101
3CX Networking Software Development VoIP 

3CX Phone System version 20: new features, API support and hosting flexibilities

September 26, 2024May 12, 2025 ToughDev 0 Comment 3cx, call control api, voip

The last time I worked with 3CX was back in 2018, during a call center deployment where I used the

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IMG_0099
Hardware Networking Vintage Computing VoIP Windows Tips 

Dial-up Internet access in 2024 using the Viking DLE-200B telephone line simulator

May 28, 2024October 21, 2024 ToughDev 2 Comments dial-up, DLE-200B, Internet access, mypal, phone line simulator, retrozilla

I got to know the Internet in secondary school, using a 33.6Kbps US Robotics dial-up modem on my Pentium I

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Screenshot 2023-04-30 234653
Product Reviews VoIP 

Receive unlimited incoming VoIP calls with FlyNumber’s virtual phone numbers and SIP2SIP

May 1, 2023September 15, 2023 ToughDev 1 Comment flynumber, sip2sip, zoiper

Recently I was introduced to FlyNumber, an easy-to-use cloud VoIP provider which offers PBX services as well as virtual phone

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rule_strip2
.NET Framework 3CX CodeProject Software Development VoIP 

3CX Call Control API on 3CX Phone System version 15

May 8, 2018April 4, 2023 ToughDev 16 Comments 3cx, call control api, pjsip, voip

I revisited the 3CX Call Control API in one of my latest projects, this time on 3CX version 15.5. The last

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linphone_name_invalid
CodeProject Reverse-engineer VoIP Windows Tips 

Fixing video recording issues in Linphone v4.1.1 for Windows

October 19, 2017April 4, 2023 ToughDev 3 Comments c++, linphone, qt, windows

In one of my projects, I noticed an interesting issue with Linphone v4.1.1 for Windows, a popular open-source cross-platform VoIP application. If I attempted

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Connectivity-Trunks
FreePBX Hoiio Product Reviews VoIP 

Configuring Hoiio SIP provider to work with FreePBX

April 12, 2015May 9, 2023 ToughDev 1 Comment

This article shows you how to configure Hoiio, a popular Singapore-based VoIP provider, to work with FreePBX. For demonstration purposes,

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3cx_add_provider
3CX Hoiio Product Reviews VoIP 

Configuring Hoiio SIP provider to work with 3CX Phone System

April 5, 2015October 23, 2024 ToughDev 0 Comment 3cx

This article shows you how to configure Hoiio, a popular Singapore-based VoIP provider, to work with 3CX Phone System running

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.NET Framework 3CX CodeProject Database Software Development VoIP 

Accessing 3CX Call Data Record (CDR) PostgreSQL database

October 2, 2013October 23, 2024 ToughDev 17 Comments 3cx

UPDATE (May 2018): See my latest article for more information on how to manage calls programmatically on 3CX v15. The article below was

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3cx phone
.NET Framework 3CX CodeProject Reverse-engineer Software Development VoIP 

Creating calls and conferences using 3CX Call Control API

September 7, 2013October 23, 2024 ToughDev 5 Comments 3cx

UPDATE (May 2018): See my latest article for more information on how to manage calls programmatically on 3CX v15. The article below was

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3CX CodeProject VoIP 

3CX Call Data Record (CDR) output file format

February 16, 2013October 23, 2024 ToughDev 15 Comments 3cx

UPDATE (May 2018): See my latest article for more information on how to manage calls programmatically on 3CX v15. The article below was written

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3CX ASP/ASP.NET CodeProject Software Development VoIP 

Using 3CX Call Control API in a .NET application

January 25, 2013October 23, 2024 ToughDev 16 Comments 3cx

UPDATE (May 2018): See my latest article for more information on how to manage calls programmatically on 3CX v15. The article below was

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VoIP Windows Mobile 

Native SIP on Windows Mobile 6.1 and 6.5

April 28, 2010May 4, 2023 ToughDev 1 Comment

Although Windows Mobile 6.1 and above supports SIP natively, the user does not always have the ability to configure SIP

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VoIP 

Free auto-expiring US DID numbers

September 3, 2009May 4, 2023 ToughDev 0 Comment

In my previous post, I’ve shown to you how to get a US DID number which, upon called, will forward

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Product Reviews VoIP 

Remove expired fax license warning in Kapanga softphone

August 8, 2009May 14, 2023 ToughDev 3 Comments

As mentioned in my previous post, you can use Kapanga softphone free edition to send faxes via SIP protocol. However,

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Product Reviews VoIP 

Sending fax using SIP

August 5, 2009May 14, 2023 ToughDev 1 Comment

If you have a subscription with a SIP provider that supports T38, you can use Kapanga softphone to send fax

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About ToughDev

Since 2008, ToughDev has been extensively exploring a variety of technical topics—from software development to electronics design. Key areas of focus include Android and iOS programming, VoIP technologies, embedded systems using Arduino and PIC microcontrollers, reverse engineering, and retro-computing.

Recent highlights include running macOS Sequoia on a Dell Latitude, teardown of the vintage Tandy 2500RSX—a powerful 386 system by Tandy Corporation, the Super 8086 Box—a home-built PC XT emulator with full legacy hardware support— and the dsMP3, a custom-designed multi-band radio with MP3 recording and playback.

Got something cool or curious to share? Get in touch—whether it's a retro challenge, embedded puzzle, or deep tech curiosity, I’m always open to fresh ideas and unique projects. You can also learn more about what I do on the About ToughDev page

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