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Toner #642911 06/09/22 10:55 PM
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SIG ALG and consumer-grade routers tend to be more problematic. More than once I have had to troubleshoot a VoIP system connected to a Nighthawk router. These also tend to have SIP ALG on by default. I had to factory reset the last one for the phones to work. Other times I had to power cycle them.

A handy tool to detect SIP ALG:
http://mcstest.visualware.com/myspeed/myvoiph5_g711_sipalg.html

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Toner #642912 06/10/22 12:11 AM
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IMHO, I think you need to get Internet speed out of the customer's head when talking about VoIP. I have not seen issues related to the Internet bandwidth in a long time It is always the Quality of Service. When the Internet speed becomes an issue is when they are doing heavy uploading, such as cloud backups. The upload speed is almost always slower.

I have seen new problems arise after the customer upgrades their internet speeds. I had one user repeatedly tell me that he should have plenty of bandwidth because he just upgraded his internet speeds. All the issues happened after the speed upgrade. VoIP was working just fine on the slower speeds.

Another customer had a Unifi USG router. Issues after the Internet upgrade, in this case, were likely due to the router bottleneck. I disabled all the extra features, like intrusion detection. That fixed their problems. The router did not have enough throughput to handle the faster Internet speeds with all the security options enabled. A lot of these business routers have a throughput of about 300-500 Mbps when you start to enable extra AV or other security features.

Packet loss is the real killer of VoIP.

This is another nice tool to visually show the customer the ISP issues:
https://www.pingplotter.com/

Last edited by newtecky; 06/10/22 12:12 AM.
Toner #642917 06/10/22 05:37 PM
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Cyber Security is a major issue today.. I'd be very careful about what you disable.

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Originally Posted by hitechcomm
Cyber Security is a major issue today. I'd be very careful about what you disable.

This is why out of the box I normally turn on all security features that come with the security appliance (if licensed). You just have to be aware of limitations and potential bottlenecks that can be created with these additional security features,

The Ubiquiti USG at a customer location, that I mentioned was getting tons of dropped packets and very poor audio. If you look at the link below, you see that the USG throughput drops from up to about 900 Mbps with IPS disabled, down to only 80 Mbps with it enabled.

https://community.ui.com/questions/...ass/5f2d6a32-7d90-4168-9407-a5dd02980c4e

When I disabled IPS, no more dropped packets and the audio was fine.
The VoIP phone service had been working fine for a couple of years until the customer upgraded their Internet speeds.

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