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Happy New Year: Introducing Incredible PBX 2027

If we have one complaint with open source VoIP telephony, it would be this. Commercial PBXs used to last for a decade or more. Now, most open source VoIP platforms are measured in months. So, we have a better idea. We’re going to tell you up front how long Incredible PBX 2027 with Rocky 8 and Asterisk® 20 and FreePBX® 16 is going to be supported. And, for procrastinators, you’ll have until the fall of that year to line up an alternative. Having said all of that, we are pleased to introduce Incredible PBX 2027-R for Rocky 8 and AlmaLinux 8 featuring Asterisk 20 and your choice of FreePBX 15 or 16.

UPDATE: Proxmox image of Incredible PBX 2027-R now available in the Incredible PBX Repository.

CAUTION: Because of frequent changes in Rocky 8 that regularly "break things," we no longer recommend it for production use with Incredible PBX>

Begin by downloading and installing Rocky 8 Minimal. If you prefer AlmaLinux, download and install their minimal image from here. If you prefer a cloud-based platform, consider CrownCloud for $25/year or our Platinum sponsor, Vultr. Both providers host Rocky 8 and AlmaLinux 8 AMD64 images in addition to other operating systems so platform setup is quick.

Once you have your platform up and running, login as root and issue the following commands to kick off the Incredible PBX 2022 install:

cd /root
yum -y install wget tar
wget http://incrediblepbx.com/incrediblepbx2027.tar.gz
tar zxvf incrediblepbx2027.tar.gz
rm -f incrediblepbx2027.tar.gz

Once the Phase I install finishes, your server will reboot. Log back in as root and run the installer a second time:

cd /root

When the install finishes, reboot your server and login again as root. Incredible PBX will run the Automatic Update Utility to bring your server up to current specs.

If you chose to install AlmaLinux 8, issue the following command while still logged into the Linux CLI as root:

sed -i 's|Rocky 8|AlmaLinux 8|' /usr/local/sbin/pbxstatus

Just a few more preliminary steps, and you’ll be ready to go:

1. Create a secure root password for your server by issuing the command: passwd

2. Remove temporary user account: userdel -r temp-user-name

3. Set up an admin password for browser access to the FreePBX GUI: /root/admin-pw-change

4. Set up an admin password for Apache access to AsteriDex and Reminders: /root/apache-pw-change

5. Set the correct time zone for your server: /root/timezone-setup

6. If free -h shows no swapfile enabled, issue this command: /root/create-swapfile-DO

As with all Incredible PBX builds, a preconfigured Linux firewall is included which blocks all access except from whitelisted IP addresses. You can whitelist additional IP addresses using the /root/add-ip script or /root/add-fqdn.

You’re now ready to explore the Incredible PBX feature set using the tutorials available on the Incredible PBX Wiki.

Configuring Gmail Smarthost for Incredible PBX 2027

One piece you’ll need for many tasks in Incredible PBX 2027-R is a way to send emails from your server. The easiest method to accomplish this is to configure SendMail to use a Gmail SmartHost. We’ve included a script in the /root folder to make it painless. Simply run: /root/enable-gmail-smarthost-for-sendmail. When prompted, enter your Gmail account name (without @gmail.com) and then enter a Gmail Application Password, not your standard Gmail password. If you don’t have one, you can obtain one here. Once you’ve configured SendMail, try things out by sending an email to any valid email address:

echo "test" | mail -s testmessage someone@somewhere.vom

Upgrading to FreePBX 16 with Incredible PBX 2027-R

By default, Incredible PBX 2027-R comes preconfigured with the tried-and-true FreePBX 15 GUI. But there’s a new kid on the block, FreePBX 16. If you’d like to take it for a spin, the upgrade is painless. Simply issue the following command while logged into your server as root: /root/upgrade-to-FreePBX16.

Audio Issues with Incredible PBX 2027-R

If you experience one-way or no audio on some calls, add your external IP address and LAN subnet in the GUI by navigating to Settings -> Asterisk SIP Settings. In the NAT Settings section, click Detect Network Settings. Click Submit and Apply Settings to save your changes. While you’re there, click on the chan/pjsip tab and set Allow Transports Reload to NO.

Choosing SIP Providers for Incredible PBX 2027-R

Incredible PBX 2027-R comes preconfigured with support for five SIP extensions and a dozen major SIP providers including Skyetel, VoIP.ms, V1VoIP, and Anveo Direct. We hope you’ll choose Skyetel not only because they financially support Nerd Vittles and our open source projects, but also because it is a clearly superior platform offering crystal-clear communications and triple-redundancy so you never miss a call. Skyetel also sets itself apart from the other providers in the support department. They actually respond to issues, and there’s never a charge. As the old saying goes, they may not be the cheapest, but you get what you pay for. Even without taking advantage of Nerd Vittles half-price offer on up to $500 of Skyetel services, they’re still dirt cheap compared to the Bell Sisters and cable companies. Skyetel is so sure you’ll love their service that they give you a $10 credit to kick the tires before you ever spend a dime. Traditional DIDs are $1 per month. Outbound conversational calls are $0.012 per minute. Incoming conversational calls are a penny a minute, and CallerID lookups are $0.004. You only pay for minutes you use. Once you’re satisfied with the service and fund your account, you can port in your existing DIDs at no cost for 60 days after signup. In short, you have nothing to lose by trying out the Skyetel service.

Configuring Skyetel for Incredible PBX 2027-R

If you’ve decided to go with Skyetel, here’s the drill. Sign up for Skyetel service and take advantage of the Nerd Vittles specials. First, complete the Prequalification Form here. You then will be provided a link to the Skyetel site to complete your registration. Once you have registered on the Skyetel site and your account has been activated, open a support ticket and request the $10 credit for your account by referencing the Nerd Vittles special offer. Once you are satisfied with the service, fund your account as desired, and Skyetel will match your deposit of up to $250 simply by opening another ticket. That gets you up to $500 of half-price calling. Credit is limited to one per person/company/address/location. Effective 10/1/2023, $25/month minimum spend required.

Skyetel typically does not use SIP registrations to make connections to your PBX. Instead, Skyetel utilizes Endpoint Groups to identify which servers can communicate with the Skyetel service. An Endpoint Group consists of a Name, an IP address, a UDP or TCP port for the connection, and a numerical Priority for the group. For incoming calls destined to your PBX, DIDs are associated with an Endpoint Group to route the calls to your PBX. For outgoing calls from your PBX, a matching Endpoint Group is required to authorize outbound calls through the Skyetel network. Thus, the first step in configuring the Skyetel side for use with your PBX is to set up an Endpoint Group. Here’s a typical setup for Incredible PBX 2020:

  • Name: MyPBX
  • Priority: 1
  • IP Address: PBX-Public-IP-Address
  • Port: 5060
  • Protocol: UDP
  • Description: my.incrediblepbx.com

To receive incoming PSTN calls, you’ll need at least one DID. On the Skyetel site, you acquire DIDs under the Phone Numbers tab. You have the option of Porting in Existing Numbers (free for the first 60 days after you sign up for service) or purchasing new ones under the Buy Phone Numbers menu option.

Once you have acquired one or more DIDs, navigate to the Local Numbers or Toll Free Numbers tab and specify the desired SIP Format and Endpoint Group for each DID. Add SMS/MMS and E911 support, if desired. Call Forwarding and Failover are also supported. That completes the VoIP setup on the Skyetel side. System Status is always available here.

Configuring VoIP.ms for Incredible PBX 2027-R

To sign up for VoIP.ms service, may we suggest you use our signup link so that Nerd Vittles gets a referral credit for your signup. Once your account is set up, you’ll need to set up a SIP SubAccount and, for Authentication Type, choose Static IP Authentication and enter your Incredible PBX 2027-R server’s public IP address. For Transport, choose UDP. For Device Type, choose Asterisk, IP PBX, Gateway or VoIP Switch. Order a DID in their web panel, and then point the DID to the SubAccount you just created. Be sure to specify atlanta1.voip.ms as the POP from which to receive incoming calls. In the Incredible PBX GUI, be sure to enable the VoIP.ms trunk.

Configuring V1VoIP for Incredible PBX 2027-R

To sign up for V1VoIP service, sign up on their web site. Then login to your account and order a DID under the DIDs tab. Once the DID has been assigned, choose View DIDs and click on the Forwarding button beside your DID. For Option #1, choose Forward to IP Address/PBX. For the Forwarding Address, enter the public IP address of your server. For the T/O (timeout) value, set it to 2o seconds. Then click the Update button. Under the Termination tab, create a new Endpoint with the public IP address of your server so that you can place outbound calls through V1VoIP. In the Incredible PBX GUI, be sure to enable all of the V1VoIP trunks.

Configuring Anveo Direct for Incredible PBX 2027-R

To sign up for Anveo Direct service, sign up on their web site and then login. After adding funds to your account, purchase a DID under Inbound Service -> Order DID. Next, choose Configure Destination SIP Trunk. Give the Trunk a name. For the Primary SIP URI, enter $[E164]$@server-IP-address. For Call Options, select your new DID from the list. You also must whitelist your public IP address under Outbound Service -> Configure. Create a new Call Termination Trunk and name it to match your server. For Dialing Prefix, choose six alphanumeric characters beginning with a zero. In Authorized IP Addresses, enter the public IP address of your server. Set an appropriate rate cap. We like $0.01 per minute to be safe. Set a concurrent calls limit. We like 2. For the Call Routing Method, choose Least Cost unless you’re feeling extravagant. For Routes/Carriers, choose Standard Routes. Write down your Dialing Prefix and then click the Save button.

Before you can make outbound calls through Anveo Direct from your PBX, you first must configure the Dialing Prefix that you wrote down in the previous step. Log into the GUI as admin using a web browser and edit the Anveo-Out trunk in Connectivity -> Trunks. Enable the Trunk. Then click on the custom-Settings tab and replace anveo-pin with your actual Dialing Prefix. Click Submit and Apply Config to complete the setup. In the Incredible PBX GUI, be sure to enable all of the remaining Anveo trunks.

By default, incoming Anveo Direct calls will be processed by the Default inbound route on your PBX. If you wish to redirect incoming Anveo Direct calls using DID-specific inbound routes, then you’ve got a bit more work to do. In addition to creating the inbound route using the 11-digit Anveo Direct DID, enter the following commands after logging into your server as root using SSH/Putty:

cd /etc/asterisk
echo "[from-anveo]" >> extensions_custom.conf
echo "exten => _.,1,Ringing" >> extensions_custom.conf
echo "exten => _.,n,Goto(from-trunk,\\${SIP_HEADER(X-anveo-e164)},1)" >> extensions_custom.conf
asterisk -rx "dialplan reload"

Configuring BulkVS for Incredible PBX 2027-R

Unlike traditional telephony, you have nothing to lose by configuring multiple trunks with Incredible PBX. If you don’t make calls using one or more of the trunks, you pay nothing. Another more recent provider with excellent rates is BulkVS. We’ve covered the BulkVS setup in a separate tutorial if you’d like to give them a try.

Configuring a Softphone for Incredible PBX 2027-R

We’re in the home stretch now. You can connect virtually any kind of telephone to your new PBX. Plain Old Phones require an analog telephone adapter (ATA) which can be a separate board in your computer from a company such as Digium. Or it can be a standalone SIP device. SIP phones can be connected directly so long as they have an IP address. These could be hardware devices or software devices such as the YateClient softphone. We’ll start with a free one today so you can begin making calls. You can find dozens of recommendations for hardware-based SIP phones both on Nerd Vittles and the VoIP-Info.org Forum when you’re ready to get serious about VoIP telephony.

We recommend YateClient for Windows which is free. Download it from here. Run YateClient once you’ve installed it and enter the credentials for the 701 extension on Incredible PBX. You can find them by running /root/show-passwords. You’ll need the IP address of your server plus your extension 701 password. In the YateClient, fill in the blanks using the IP address of your Server, 701 for your Username, and whatever Password was assigned to the extension when you installed Incredible PBX. Click OK to save your entries.

Once you are registered to extension 701, close the Account window. Then click on YATE’s Telephony Tab and place some test calls to the numerous apps that are preconfigured on Incredible PBX. Dial a few of these to get started:

DEMO - Apps Demo
123 - Reminders
947 - Weather by ZIP Code
951 - Yahoo News Headlines
TODAY - Today in History
LENNY - The Telemarketer's Worst Nightmare

If you are a Mac user, another great no-frills softphone is Telephone. Just download and install it from the Mac App Store. For Android users, check out the terrific new VitalPBX Communicator. Works flawlessly with Incredible PBX.

Introducing WebMin for Incredible PBX 2027-R

WebMin is also installed and configured as part of the base install. The root password for access is the same as your Linux root password. We strongly recommend that you not use WebMin to make configuration changes to your server. You may inadvertently damage the operation of your PBX beyond repair. WebMin is an excellent tool to LOOK at how your server is configured. When used for that purpose, we highly recommend WebMin as a way to become familiar with your Linux configuration. To access WebMin, open a browser to http://server-ip-address:9001.

Incredible PBX Administration

We’ve eased the pain of administering your new PBX with a collection of scripts which you will find in the /root folder after logging in as root with SSH or Putty. Here’s a quick summary of what each of the scripts does.

add-fqdn is used to whitelist a fully-qualified domain name in the firewall. Because Incredible PBX 2020 blocks all traffic from IP addresses that are not whitelisted, this is what you use to authorize an external user for your PBX. The advantage of an FQDN is that you can use a dynamic DNS service to automatically update the IP address associated with an FQDN so that you never lose connectivity.

add-ip is used to whitelist a public IP address in the firewall. See the add-fqdn explanation as to why this matters.

del-acct is used to remove an IP address or FQDN from the firewall’s whitelist.

admin-pw-change is used to set the admin password for access to the FreePBX/Incredible PBX web GUI using a browser pointed to the local IP address of your server.

apache-pw-change is used to set the admin password for access to Apache/Incredible PBX apps including AsteriDex and Reminders. This provides a password layer of protection for access to these applications.

reset-conference-pins is a script that automatically and randomly resets the user and admin pins for access to the preconfigured conferencing application. Dial C-O-N-F from any registered SIP phone to connect to the conference.

reset-extension-passwords is a script that automatically and randomly resets ALL of the SIP passwords for extensions 701-705. Be careful using this one, or you may disable existing registered phones and cause Fail2Ban to blacklist the IP addresses of those users. HINT: You can place a call to the Ring Group associated with all five extensions by dialing 777.

reset-reminders-pin is a script that automatically and randomly resets the pin required to access the Telephone Reminders application by dialing 123. It’s important to protect this application because a nefarious user could set up a reminder to call a number anywhere in the world assuming your SIP provider’s account was configured to allow such calls.

show-feature-codes is a cheat sheet for all of the feature codes which can be dialed from any registered SIP phone. It documents how powerful a platform Incredible PBX 2020 actually is. A similar listing is available in the GUI at Admin -> Feature Codes.

show-passwords is a script that displays most of the passwords associated with Incredible PBX 2020. This includes SIP extension passwords, voicemail pins, conference pins, telephone reminders pin, and your Anveo Direct outbound calling pin (if configured). Note that voicemail pins are configured by the user of a SIP extension the first time the user accesses the voicemail system by dialing *97.

update-IncrediblePBX is the Automatic Update Utility which checks for server updates from incrediblepbx.com every time you log into your server as root using SSH or Putty. Do NOT disable it as it is used to load important fixes and security updates when necessary. We recommend logging into your server at least once a week.

pbxstatus (shown above) displays status of all major components of Incredible PBX.

Forwarding Calls to Your Cellphone. Keep in mind that inbound calls to your DIDs automatically ring all five SIP extensions, 701-705. The easiest way to also ring your cellphone is to set one of these five extensions to forward incoming calls to your cellphone. After logging into your PBX as root, issue the following command to forward calls from extension 705 to your cellphone: asterisk -rx "database put CF 705 6781234567"

To remove call forwarding: asterisk -rx "database del CF 705"

Implementing Call By Name with 411

Once you have an Outbound Trunk and Route configured, deploying Call by Name by dialing 411 is simple. The way it works is to pick up any phone connected to your PBX and dial 411. When prompted for the name of the person or company to call, say the name as you entered it in the AsteriDex directory, e.g. Delta Air Lines. The name will then be looked up to decipher the number of the person or company to call. Then the call will be placed using your default outbound route. To deploy Call By Name, simply follow the setup instructions in this Nerd Vittles tutorial.

Keeping FreePBX Modules Current

We strongly recommend that you periodically update all of your FreePBX modules to eliminate bugs and to reduce security vulnerabilities. From the Linux CLI, log into your server as root and issue the following commands:

rm -f /tmp/*
fwconsole ma upgradeall
fwconsole reload

Where To Go From Here

Complete documentation on the ClearlyIP Devices Module is available here.

Complete documentation on the FreePBX GPL Modules is available here.

Complete documentation on the Incredible PBX additions is available here.

An introduction to configuring extensions, trunks, and routes is available here.

Originally published: Sunday, January 1, 2023

Need help with Asterisk? Visit the VoIP-info Forum.


Special Thanks to Our Generous Sponsors

FULL DISCLOSURE: ClearlyIP, Skyetel, Vitelity, DigitalOcean, Vultr, VoIP.ms, 3CX, Sangoma, TelecomsXchange and VitalPBX have provided financial support to Nerd Vittles and our open source projects through advertising, referral revenue, and/or merchandise. As an Amazon Associate and Best Buy Affiliate, we also earn from qualifying purchases. We’ve chosen these providers not the other way around. Our decisions are based upon their corporate reputation and the quality of their offerings and pricing. Our recommendations regarding technology are reached without regard to financial compensation except in situations in which comparable products at comparable pricing are available from multiple sources. In this limited case, we support our sponsors because our sponsors support us.

BOGO Bonaza: Enjoy state-of-the-art VoIP service with a $10 credit and half-price SIP service on up to $500 of Skyetel trunking with free number porting when you fund your Skyetel account. No limits on number of simultaneous calls. Quadruple data center redundancy. $25 monthly minimum spend required. Tutorial and sign up details are here.

The lynchpin of Incredible PBX 2020 and beyond is ClearlyIP components which bring management of FreePBX modules and SIP phone integration to a level never before available with any other Asterisk distribution. And now you can configure and reconfigure your new Incredible PBX phones from the convenience of the Incredible PBX GUI.

VitalPBX is perhaps the fastest-growing PBX offering based upon Asterisk with an installed presence in more than 100 countries worldwide. VitalPBX has generously provided a customized White Label version of Incredible PBX tailored for use with all Incredible PBX and VitalPBX custom applications. Follow this link for a free test drive!

Special Thanks to Vitelity. Vitelity is now Voyant Communications and has halted new registrations for the time being. Our special thanks to Vitelity for their unwavering financial support over many years and to the many Nerd Vittles readers who continue to enjoy the benefits of their service offerings. We will keep everyone posted on further developments.



  1. I did a fresh install of IncrediblePBX 2027 and now I’m trying to get IncredibleFax installed. However I’m not finding the file /root/incrediblefax13.sh or any installation .sh for a faxing engine in the root folder.

    Therefore how do we get AvantFax or some other type of faxing service installed with IncrediblePBX 2027?

    [WM: No Incredible Fax for Rocky 8 yet. If you need it, you’ll need to drop back to one of the 2020 or 2021 platforms with CentOS 7 or Debian.]

  2. Can the Oracle Instance be upgraded to this or how would you install this on the Oracle Instance?

    [WM: Not yet, but stay tuned.]

  3. You might want to add "yum-y install tar" to your copy and paste instructions Rocky 8 on Crown Cloud does not have it preinstalled. Great article.

  4. Great seeing updates!

    Any benefit to Alma/Rocky vs Debian? Have running Debian installs with Ast18/F15, want to move everything to Deb 11/Ast20/F16 so don’t have to touch it for awhile.
    Thanks Ward!

  5. Skyetel has been moving to new banks of IP subnets for redundancy, etc. that are different than the default SIP trunks in IPBX2027. They also suggest using PJSIP two create just two trunks this way – in & out.

    Here are the added IPBX2027 steps I found to get the old disabled & the new two PJSIP trunks laid down/operational:

    1) Disable old SIP Skeytel trunks

    2) Add the following to the "/usr/local/sbin/iptables-custom" …

    /usr/sbin/iptables -A INPUT -s -j ACCEPT
    /usr/sbin/iptables -A INPUT -s -j ACCEPT
    /usr/sbin/iptables -A INPUT -s -j ACCEPT
    /usr/sbin/iptables -A INPUT -s -j ACCEPT
    /usr/sbin/iptables -A INPUT -s -j ACCEPT
    /usr/sbin/iptables -A INPUT -s -j ACCEPT
    /usr/sbin/iptables -A INPUT -s -j ACCEPT

    3) "iptables-restart"

    4) If you have a hardware firewall with say whitelisting, be sure to add these subnets & IP’s there as well of course.

    5) Follow Skyetel’s FreePBX PJSIP trunk directions:

    INBOUND: https://support.skyetel.com/hc/en-us/articles/4410765264791-FreePBX-13-Create-Inbound-Trunk

    OUTBOUND North America: https://support.skyetel.com/hc/en-us/articles/4410672050967-FreePBX-13-Create-Outbound-Trunk-for-North-America

    6) Create or change your Skyetel "IP Authentication -> IP Group" entry to use 5061 rather than 5060 to connect

    That’s it, and only two trunks using latest Skyetel infrastructure.

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