How can you tell if the line has errors?

I'll try and keep this as brief as possible.
<background>
For 2years (up to 6months ago) I was on BE ADSL and was very impressed with the quality of the service (low latency, decent bandwidth) on my line. However when I heard that FTTC was being rolled out I switched to Zen internet on the understanding that I could then switch to the FTTC product as soon as it was available.
Immediately after switching to Zen I started to experience problems with VOIP (I use VOIP extensions against an externally hosted PBX) and was seeing CRC errors on the line. In the process (~2months) of getting this diagnosed the FTTC product became available and since I wanted uncapped switched to BT Infinity for Business Option 2.
</background>
I now find that again I get sporadic VOIP problems (but not as bad as on the ADSL2 service via Zen) but very regular BBC iPlayer dropouts listening to the radio.
Due to the previous problems whilst on ADSL2 I suspect I still have a minor line fault but as I can't access any stats on the line have no way to verify. Does anyone have any pointers on where to get line stats to see what is going on on the connection? I can't get any info out of the OR modem.
Regarding my network. I am using a cabled, gigabit connection directly to a Draytek 2820n which is in turn doing the PPPoE through the BT OR modem. I use two different machines and experience the same issues on both. I'm a server & network admin by trade so pretty sure it's not my internal infrastructure at fault.
My IP profile is apparently 38717 Kbps down / 10000 KBps up.
BT Speed tester shows achieved 26581 down and 4912 up though

jmansford,
I may be wrong about this as I am only refering to my own 2750n settings,but looking at your upload throughput test results some if not all of your problems could be due to a wrongly wieghted QoS setting and/or port capacity setting based on QoS.
As you line profile is ok at 38717 Kbps down / 10000 KBps up it looks like there is no problem on your actual line,but phone line noise test might find some crackle,but I don`t think so.
By your post,you say your are routing PPPoE through the Draytek into the OR modem.?
If so,maybe you could try leaving the OR or Draytek out of the chain as a process of testing where faults [if any] are.?
To sum up a bit imo leaving the OR modem out of the net chain might be a better way as I only use the 2750n on it`s own as the OR modem is not then needed.
Opps! sorry I might be wrong in my above thinking,but is your Draytek just a router or a modem/router combined like the 2750n.?
But either way the QoS setting are still important.

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