Hi,
Re CDR
Check that you have "log CDR to MySQL" turned ON in Globals.
Re Echo,
We have no reported echo on 1.4, either on SIP or TDM channels. It has been running live on our office switch (over Gamma and ISDN BRI) for over a month now without problems. However, we have no experience of using softphones or ATA's (other than Channel banks). All of our testing is done with SNOM, Aastra and Cisco/Linksys SIP handsets. We've no experience with VoipStunt or Voipbuster either I'm afaraid, although a quick look at the two websites would suggest that they are one and the same carrier. Have you run echo free with this carrier with an earlier release of Asterisk?
Kind Regards
Selintra