asterisk users - Jun 2016 - asterisk 11.6-cert13 and g729 codec one way audio

Hello.

Recently I've installed Asterisk 11.6-cert13 on a physical server. 
Downloaded g729 codec from asterisk.hosting.lv for version 11 
codec_g729-ast110-gcc4-glibc-x86_64-core2-sse4.so and installed as 
instructed.

Asterisk starts and `core show codecs` shows G.729A codec. Also `core 
show translation` show 15000 for g729 to alaw and alaw to g729.

The client authenticated has allowed calls alaw,ulaw,gsm,g729 (in this 
order). Client has enabled only g729 codec only.

When client calls a number, which is routed to a trunk which uses only 
alaw codec, connections is established, but voice from client to the 
called party is not heared. Voice from called party to client is heard. 
So alaw to g729 translation is done, but g729 to alaw is not working.

When client uses only alaw codec, or ulaw codec, voice works ok in both 
ends.

What can be cause with the g729 codec?

Thank you.