[Asterisk-Users] Asterisk+IVR functions trouble

[alex3377]

I' got a problem, using asterisk-rc2 :IVR functions (Background...Playback...etc) doesn't works : Executing Background("OH323/RXXXXX", "vm-extension") in new stack 
channel.c:1650 ast_set_write_fornat: Unable to find path from GSM to G729A---Asterisk box supplied only with network adapter.---Asterisk box registered in Mera (soft-switch with H323 protocol) and doing SIP-endpoints (such as ATA). and G729A is preferred codec to my needs.Is this trouble associated with G729A codec?