‘dead air’ issue resolved
We finally outgrew the rather gnarly method we were using to provide custom ringback tones. We, of course, had anticipated this and were in the midst of testing a vastly more elegant (and flexible) method.
We moved that new method into production yesterday and the system is running smoothly again. If you are still experiencing long periods (more than a few seconds) of silence after the sponsor’s message please let us know here.