​The Most Popular Features included in the BETA are voicemail to text transcription, queue ringtones and multicast provisioning have been introduced in the current Update 4 .
The list of features included in Update 4 are as follows :-
Voicemail to Text Transcription –  Read the guide on how to set this up.
1.Queue Ringtones and Multicast Provisioning
2. Alternative 3CX Supported Firmware
3. UTF8 encoding in recording file names
4. Dashboard bar notifications for Firewall messages, Custom IP phone templates and Unsupported VoIP Providers. “Firewall Custom template Unsupported Provider”
5.3CX SIP Server option to unbind from IPv6
In addition to the above the final release also includes:
1. IPv6 rules for IP6tables
2. Adjusted DST values for Fanvil Phones.
How to update
If you are on v15.5, SP1,  SP2,  SP3, or SP4 BETA simply go to the updates section on the dashboard of the management console where you will see a release update 15.5 SP4. Click on the update and 15.5 SP4 will be installed.
If you want to download a new installation you can download the Linux or the Windows version.
Windows: https://downloads.3cx.com/downloads/3CXPhoneSystem155.exe
Linux: Follow this guide and download the 3CX ISO here.
View the complete change log.

The OS2201 single-port ADSL2+/VDSL2 modem router is an ideal low-cost solution for xDSL service termination.
Learn more about  single-box versus multi-box architectures in the white paper:
CPE Architecture: When Does All-IP Equal All-in-One?

​One-box CPE architectures
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The new SmartNode™ portfolio of xDSL integrated access devices (IADs)  combine auto-sensing ADSL2+/VDSL2 termination with L3/4 routing, and network protection—plus media gateway, signaling and other higher-layer networking functions. For detailed specifications and product selection guidance, get the new SmartNode IAD Solutions Brochure.
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For a complete introduction to the new Patton vDSL CPE solutions, Watch Now on Sitec Youtube Play :

Following Update 4 of 3CX v15.5, 3CX has released a new build of the 3CX Call Flow Designer which includes new features and fixes! This new version adds a new “Record and Email” component, updated regions for the Amazon Polly TTS engine, and a new date range feature for the Date & Time conditional component.
The new “Record and Email” component allows recording audio from the caller, and sends it attached to an email message. If the recording is finished because the caller hangs up, the email will be sent without needing to add any component to the Disconnect Handler flow, simplifying this very common task.​

Another very common need when using the Date & Time conditional component, is the ability to set date ranges. For example, when an office is closed for 2 weeks, instead of adding a “Specific day” condition for each day, you can use a “Date range” condition. This new condition will be met when the date is between the “from” and “to” dates specified (both included), and the time is between the “from” and “to” values.​