Hi Buga,
I am not familiar with ECU and VOLIB, but regarding your first question, the error message is saying that the linker cannot find the two symbols corresponding to the function tables exported by the G729 codec libraries. I'd suggest you first make sure that the symbols _G729ABDEC_TII_IG729ABDEC and _G729ABENC_TII_IG729ABENC are indeed in their respective libraries g729abdec_tii_elf.l64P and g729abenc_tii_elf.l64P (you can use a tool such as nm6x to dump the symbols from the binaries).
If they are not in the library files, then there could be something wrong with the way the libraries are built, or maybe the server should be looking for a different symbol - possibly due to the codec packages exporting the wrong function table symbols in the G729ABENC.xdc and G729ABDEC.xdc files. If they are in the library files, you may want to try redoing the codec packages (if you created them) and/or codec server. The wizards may help:
http://processors.wiki.ti.com/index.php/Codec_Engine_GenServer_Wizard_FAQ
http://processors.wiki.ti.com/index.php/Codec_Engine_GenCodecPkg_Wizard_FAQ
Best regards,
Vincent