Translate.c: No translator path from alaw to unknown when using chanspy

Hi,

FreePBX 2.9.0.7
asterisk 1.8.8.1
centos 6.2 / 32bit

When I dial into chanspy (555) from my phone, I can hear the announcement of the extension number, and then silence. in the log i get the following repeated hundreds of times:
WARNING translate.c: No translator path from alaw to unknown when using chanspy

what do i need to change? the calls are g729 - we have various licenses that are all registered correctly, my phone seems to be using ulaw, but from a phone with primary coded g729 i get the same problem.

Regards,
Tim

please ignore this post. apparently there was a problem with the g729 licenses after an asterisk upgrade