The Sure Signal uses your Internet connection to route calls to and from the Vodafone network. If you have a slow or very busy Internet connection, then it is possible that call quality will degrade. Speech may be garbled and/or you will hear robotic-type noises. Vodafone describes this as “the Darlek effect”
Possible diagnostics steps to take:
Run a speed test at www.speedtest.net – you’ll need a connection that can download at at least 1Mbit. Upload should be at least 128Kbit
Test the latency of your connection with www.pingtest.net – all three metrics (ping time, packet loss, and jitter all need to be as low as possible. Check for the ‘Line quality’ section – the MOS score should be as close to 5.0 as possible.
If any metrics don’t match those outlined above, contact or possibly change your Internet Service Provider (ISP).
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Checked with Vodafone on the upload speed, and the Sure signal will not connect properly (if at all) if upload speed is less than 200kbps
Here’s what I did to fix this. I have a Linksys router, and in the menu pages, accessed through my internet browser, I found the QofS (Quality of Service) settings … in my case it was under the “Applications and Gaming” tab.
After enabling the QofS , I found two sections entitled “Device Priority” and “Ethernet Port Priority”.
The first let me prioritise traffic to two nominated devices (eg. a mobile phone ) over and above any other traffic on the router. Here I needed to enter the MAC addresses of the two phones I picked.
The second let me prioritise traffic through one particular port on the back of the router, again over and above any other traffic on the router. Here, I picked the Port number into which the Ethernet cable from the Sure Signal was plugged.
After saving the settings, I checked the quality of the calls and they were noticeably better.
Good luck!
Hey. @BlueOyster – can you share your Linksys router model? I have this issue and my Netgear DSL router doesnt have QOS. – just wanted to get your model if it works well – thanks