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| reply to DracoFelis
Re: [Equipment] Useful Sipura tricks... I'm using an SPA-2100 on ZingoTel. At first, I was quite happy with the box since calls sounded great. I later was running some speed tests on my cable connection using »www.speakeasy.net/speedtest/ and I noticed that I was getting very poor performance on my upload speed. When I went to my cable tech support, we unhooked the SPA-2100, and damned if the cable speed didn't pop up to what it should be. The SPA-2100 was eating up 2/3 of my cable connection bandwidth!!!
I called and talked with ZingoTel, and it turns out that the QoS (Quality of Service) feature in the SPA-2100 (turned on by default) does indeed eat up the bandwidth coming out of the box. I even found some references on the web to this issue:
(»faq.sipbroker.com/tiki-index.php···SPA-2100)
Under Sipura Flaws, I found: "QoS reduces available bandwidth even when there is no active phone call. I don't think there is any good reason to reduce available bandwidth except during an active phone call. (However, ALL the devices I know of that implement QoS do it this way, so it's not just a Sipura problem.)"
The only way to beat this was for them to turn of the QoS (which I did), and then my bandwidth went back to normal. Problem was, the sound on the calls wasn't very good. So I decided to upgrade my cable bandwidth in the hopes that would help. It didn't help, but now I'm addicted to the higher speed! LOL!
Now to be clear, I had the SPA-2100 set up in a typical manner where it was connected between my cable modem and my PC, acting as a router. I suffered with this for a while, but then about a week ago, I bought a wireless router. My girl friend wanted to be able to connect with her laptop when she was at my place, and I liked the idea of a hardware firewall over a software firewall, so I got the new router.
So now I had the cable modem, then the SPA-2100, then the wireless router, and then my PC, all daisy chained together. All was working good except the quality of the phone service sucked.
Well I decided something just wasn't right, and maybe I needed a different setup since this just wasn't getting the job done. So I called back to the ZingoTel folks to try to get them to send me a different ATA box, but this time I got someone in tech support that was a bit more knowledgeable. He told me that if I connected the SPA-2100 to my new router and also connected my computer to the router (instead of the back of the SPA-2100), that my speed wouldn't be killed by the QoS, the SPA-2100 would work great, and we could turn the QoS back on for good quality calls. He was exactly right. It now works perfectly and I have great sound and good speed.
It turns out that when you connect your PC to the router built into the SPA-2100 box (as you're typically instructed to do), the QoS severely limits the bandwidth that gets through to your PC. However, if you instead have another router available to you, just connect both the SPA-2100 and the PC up to that router, and all will be good.
Once caveat. He did tell me that I'd need to adjust the router's firewall setting for the SPA-2100. This is done by first going to the phone, dailing **** and then 110#. This will give you the IP address that the router has assigned to the SPA-2100. Then go into the router set up, and add that IP address to the router's DMZ so that the SPA-2100 is now outside the router's firewall.
I'm not sure this is really necessary since the phone works fine without doing it. My guess is that he wanted me to do this is only so that their tech support can talk to the SPA-2100 without my router firewall getting in the way. I've actually turned that off since I think it's good that the SPA-2100 is behind my firewall, too. However, I may need to enable it if I talk to their tech support in the future.
Hope you find this useful.
John | |
| the only ports Zingotel uses to get into the device are either 80 or 8765. The 10000-20000 UDP, 5060 UDP, and 443 TCP are fowarded so packets always reach their destination and don't get caught up and lost on your network. These ports are usually the same no matter what VoIP service you use. | |
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