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Don’t Let Verizon Block Your VoIP Connectivity

The Problem

From: Un-CEO

I was just on a phone call with a new customer who is setting up multiple retail locations. The reason for the call was their backup network wasn’t working. Whenever they tested the Verizon 4G LTE Wireless connected to Cradlepoint modem backup network, the phones would not be able to make or receive phone calls.
Their IT staff was on the line and they were running Wireshark and grabbed a PCAP that seems to show that OnSIP at was responding to their request with a “500 Server Error”.
The only problem was that the packet did not come from OnSIP. The smoking gun in the second line which references the “sipalg”. Even though the PCAP shows the packet as coming from OnSIP, it really comes from the Verizon SIP ALG running on their network or running on the Cradlepoint router.
Not only are they blocking the traffic, but they’re making it look like the provider is actually the one refusing it. At least if you’re going to block traffic, let everyone know who is doing it.
HTTP traffic from the same device to the same network goes through without an issue, only the SIP traffic is refused.
Is this the future of Net Neutrality? We saw this behavior a few years ago and it appears to still be an issue.

Our Solution

Most carriers in the Cloud PBX world aren’t doing anything to combat these troublesome issues. Some would rather act like this issue doesn’t exist. Our Dynamic PBX utilizes encrypted GRE VPN to combat issues with carriers blocking SIP traffic which allows you to run your VoIP calls securely with no interference from Verizon or any other ISP for that matter. We ensure that all internet connectivity is working properly and as expected before you even go live.

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