I am subscribed to sipphone service and use both Gizmo and Ekiga. I prefer Ekiga since it is open source, but sometimes it drops calls and sends some strange sound to the other side. My connection is not great (10kb/90kb DSL) , but when I switch to Gizmo everything is smooth and normal. I am not sure if it is my settings or not , but SIP is open protocol, right? so both of them should work fine. However since Gizmo itself is not open , I suspect they play some strange game when Gizmo works better most of the times compared to other (free) software. I am still searching , but it looks like there are no perfect solution so far.
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