We're running Asterisk 1.2.13 from a debian package.

We definitely have more problems on outgoing calls than incoming ones, but both are bad. Sometimes it's dropped connections, sometimes it's garbled sound (our internet connection is theoretically a very good one so bandwidth shouldn't be an issue), and very occasionally the one-way sound thing happens. The first two are the most common though.

thanks for helping me out with this :)

Gareth