I hear you with the 2Mb/s upload, but that isn't a problem for VoIP in and of itself. What makes 2Mb/s upload an issue with VoIP is not having a good router (i.e. one with CAKE queuing support or something similar) and then getting hammered with buffer bloat making your latencies go to 1000+ ms because someone's iPhone decided to back something up (don't know why it never seems to be an issue with Androids).

^ The above is precisely my experience and is a large part of why my workplace hasn't moved to VoIP yet, despite needing the features.