No Sound Can Be Heard

Hi ,
I have an IP based authentication trunk , they should send calls to my box ,
My issue is No Sound Can Be Heard
This is my asterisk log, I think problem is related to codecs

Thanks in Advance

v=0
o=- 50738 50738 IN IP4 37.48.72.151
s=VOS3000
c=IN IP4 37.48.72.151
t=0 0
m=audio 14340 RTP/AVP 18 101
a=rtpmap:18 G729/8000
a=fmtp:18 annexb=no
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-16
a=sendrecv

[2015-11-09 19:44:47] WARNING[2987][C-00000017] channel.c: Unable to find a codec translation path from (g729) to (slin)

[2015-11-09 19:44:47] WARNING[2987][C-00000017] channel.c: Unable to find a codec translation path from (g729) to (gsm)

You need licenses to use g729

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Can I use another codec ? or this is depend on carrier ?

It depends on the carrier

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