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You should confirm the default multicast is happening on your LAN NIC and not the WAN. Typically changing the binding order will fix it. I sometimes see this when dealing with AT&T SIP and two NICS. Many times just restarting the 3CX services will fix it which lets you know that is the issue.

Anyone experience this issue before? (images attached) Firewall Checker is passing everything but a few Media Server ports 10794 – 10824. This failed port range is consistent, however occasionally one of the failed ports in that range will pass. The error on the ports is “full cone test failed”...

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Before purchasing a gateway I would suggest looking into having Spectrum change your hand off from PRI to SIP. This will simplify your configuration and keep the high call quality your used to. At least here in my area nobody sells SIP trunks with a better value. If you're already getting...

We've been doing this for some time now in v15x for our clients to be able to quickly Park and Pickup using there mobile phones. I just noticed that v16 is now error checking importing of the phone number and won't allow SPx as a valid entry. How can I get this feature/workaround back?

:)New SBC.... Bravo! Thank you, Thank you.

I think you will find more options if you choose a provider that doesn't limit your voip channels (charge per channel). You'll just be up against your 3CX license limit. If your reaching the 3CX limit on a regular basis then increase your license.

The only downside is the Windows 10 update process, be aware of how it works so it does not force an update and unexpected reboot. You don't have the same control as Windows server by default

I’m wondering what others recommend to their clients as the best method/process for scheduling conference calls. I realize the flexibility of having multiple methods is a strength for 3CX but because the behavior is not consistent between methods it confuses users. Since there are so many...

I appreciate the responses; however the question was, "Anyone have experience using DSL for SIP, does it work well?" I am looking for "works well," "it was terrible," "works but here are some gotcha's that are DSL specific." I'm well aware of latency and jitter issues which is why I'm asking...

I have a client that is moving to a temporary space for 6 - 9 months during a remodel. The temp space will only have AT&T DSL available for Internet service. Anyone have experience using DSL for SIP, does it work well? Luckily this temp space will only have 4 extensions and very light...

No doubt on the new pc. I typically do fresh install of the OS just to be sure. I do appreciate the insight regarding .NET.

I appreciate your insight Matthew. The more I think about it, they may be better off (cost wise) buying a PC with WIndows 10 Pro. There is no driver support for that generation Dell server for Windows 10 or Server 2016/2019. The new computer will be less expensive than a server OS license...

I have a client with Dell R410, T310 and R710 servers available for use as the 3CX server but they all have Server 2008 r2. They prefer not to buy additional OS license and I see it's not "Officially" supported any longer. Any body still using it with current 3CX release? Any issues? Any...

I haven't worked with Edgemarc in a long time but I seem to remember that networks built on their equipment will be using SIP-ALG.

Unless your VoIP provider is on a separate NIC with dedicated service (not going through firewall) then resolving your firewall checker issues is step 1.

Any resolution or even acknowledgement of this issue yet?

I didn't think to open up the whole range I just tried the specific address returned from stun, stun-us,stun2, stun3. Makes since. Thanks

Lock down seems to be working but firewall checker now fails. I'm assuming because 3cx test servers are now blocked, any idea what those are, I don't see any listing for them?

I have 4 systems (2 Google, 1 AT&T, 1 Spectrum) all with the same hits in the last 24 hours. This seems to indicate possibly a targeted effort and that maybe the 3CX DNS entries are known. Since I don't have addition systems to compare yet I was just curious if others saw the same IPs in the...