Using SP232D with Asterisk, when dialling outwards to a mobile phone (tested with multiple UK carriers), the phone only makes half of the first ring-tone sound, and then is silent until the other end picks up (or doesnt). It's fine making internal calls and land-line calls, in the tests I've done.
Any ideas?
Running latest firmware (1.31 I think, phone is resetting to factory defaults now while I try more troubleshooting)
