Just an update for everyone else. I'm using a Seimens Speedstream 6520 modem and when I backed off the firmware to an older verson, this issue went away. I'm starting to wonder if it's BigPond that has somehow managed to disable VOIP calls after 30 seconds via the modem (I'm not using BigPond as my ISP).
I'm still diagnosing this issue with Martin.
Current modem update (that causes this issue) is:
Update_E752_AF5_106-71_a056_v1s
Modem firmware that is a-ok:
Update_E752_AC4_106-29_a056_v1r
Will provide further updates.
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