I've recently upgraded to new firmware 5.1.10, however it seems it breaks the ability to adhere to the chosen "preferred codec".
For some reason, if i select G729a as my preferred codec, the unit will for some reason select G711u as the active codec to place the VoIP call. This behaviour was not evident with firmware 5.1.7 - and it's not a VSP issue.
I've tried to fatory default the unit to resolve the problem but no luck! Tried to factory default and roll back to 5.1.7 and then to 5.1.5(a) and then 3.2.10 and stil no luck. (I had a back up of my config from a few months ago whilst using t 5.1.7 and tried to restore to that, (in case the upgrade to 5.1.10 mangled some settings) after factory defaulting whilst running 5.1.7 and still no luck)