I dont know why you're getting calls dropped, we're currently blocking all calls from the sip broker proxy to toll free numbers...
other carriers could be having issues due to the unwanted calls...
in the mean time, you are free to send North American toll free direct to sip.tollfreegateway.com
asterisk exten=>1800NXXXXXX,1,Dial(SIP/sip.tollfreegateway.com/${EXTEN})
Please Note, we are based in the US and can not guarantee delivery to every canadian TF number at this time
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