hi!
i have same or similar probelms using smsdiscount, voipcheap and/or intervoip via voxalot proxy - all "eu" "au" and "us" - same problem: busy signal on outgoing calls.
direct connection (windows client and gigaset c450ip) with some of betamax clones (eg. sip.smsdiscount.com) is working perfektly.
regards,
fla
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