Generally, DSL and Cable broadband connections will give the best results and should be favoured over 3G/4G, satellite and other wireless connection types.
Due to the long connection latencies, satellite connections are not well suited for use with VoIP.
The best test of your internet connection is to sign up for a free sipgate basic account. You can make free test calls with a free VoIP softphone like Zoiper:
You can quickly and easily test your internet connection's quality at these websites:
If you've limited bandwidth available, using lower bandwidth codecs only in your phone's settings and Quality of Service (QoS) rules for VoIP traffic in your router's settings may provide a solution.
Please click here for a list of the codecs supported by sipgate.
A phone may be able to register online over EDGE and GPRS connections, but VoIP calls won't be possible.
Available Bandwidth (download and upload 'Speed') alone doesn't indicate a connection's suitability for VoIP calling. Other connection characteristics like Latency, Jitter and Packet Loss are also very important.
A VoIP call (using the G.711 codec) will require circa 90 kbps both up and downstream.
As general rules of thumb, a VoIP call will tolerate latencies up to 100ms.
Voice quality will degrade with Jitter values above 20 to 25 ms (with calls being unfeasible with Jitter values above 35ms).
sipgate's SIP Servers should be accessible from any suitable internet connection around the world. If using a corporate connection or a public WiFi the network's administrator or local ISP may be blocking VoIP traffic.