The SIP tag for the FlyNumber blog. SIP, which stands for Session Initiation Protocol is a method FlyNumber uses when it comes to making and receiving phone calls. SIP is a great alternative to the more closed echo systems dominating VoIP today. Both have their merits.
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Back in 2022, I wrote a piece about entrepreneurs not taking full advantage of SIP (Session Initiation Protocol), and looking back, I feel like I was onto something...
The potential was there: an open, reliable technology that could save businesses money and give them more control over their communications. Looking back now in 2025, that post feels prescient - but with a twist I hadn't anticipated.
I was browsing around on Hacker News and if you're not familiar, the good stuff is usually in the comments. I was intrigued by this comment (by @kkielhofner) and how he/she illustrates a common but often overlooked misconception about SIP. Specifically, the misunderstanding pertains to the role and implications of port 5060 and its associated traffic in a standard SIP deployment.
Savvy entrepreneurs have been taking advantage of the versatility SIP has to offer since the mid-'90s. We're excited to see more jump on board, it's a neat alternative to the closed VoIP ecosystem. (i.e. One VoIP company app for all devices, employees etc.)
Here's a simple tutorial on how you can use the Zoiper app and sip2sip to receive unlimited incoming calls on your FlyNumber (ie. Virtual phone number)
This does not require the use of our cloud PBX system.
**Now anytime anyone calls your FlyNumber you can answer the calls for free with unlimited incoming minutes on your iPhone or Android, when you make an outgoing call you’ll pay ourlow per minute rate and have your FlyNumber show up as the Caller-ID. **
This has been the most anticipated feature coming out of our PBX/ Virtual Phone System; it will enable you to register a SIP device/client with our own internal SIP addresses. No need to use a 3rd party VOIP provider, just choose a phone number and send the calls to our “PBX”. You’ll have the ability to register multiple devices and use our legendary PBX Grid to configure your configuration. It’s never been easier to make and receive phone calls with your FlyNumber.
It’s been a while since we’ve updated the blog, our apologies . We’ve been very busy updating the “internals”, we’re about to introduce FlyNumber SIP addresses among other neat features. The exterior may look the same but there’s plenty going on inside. We’re coming out with new features almost every quarter and the PBX/ Virtual phone system is evolving very nicely. You need to try it out if you haven’t already, it’s visually appealing and the grid gives you a real sense of customization.
Using an Actual Phone
We like VoipWise because its simple, easy and free. You download the application, login or signup if you don’t have an account and you’re done. The calls get forwarded to your VoipWise account and ring right to your PC or MAC.