2nd post, this is the other problem I'm having with the OBi110 that I'm purely using as an FXO and FXS port to my Asterisk.
When using the FXO port through Asterisk, when the call initially starts, I seem to one burst of what sounds like locally generated ringtone, before going on to the Telco's ring tone. This is a bit of an issue as some numbers hear in the UK connect immediately and start playing messages, and I miss the first 2 seconds - for example, 1471 plays the number of last caller, but due to the locally generated ring burst, I miss the first 3 digits. As this doesn't happen with the Cisco SPA3102 device the OBi is replacing, I'm guessing this is an OBi setting, not Asterisk?