Constant noise in background in voip network

Hi,
we have 3 branches and 20 small home offices setup.
we installed CUCM 8.6 running and serving all the branches and home offices.
All branch voip network is good, but we hear background noise while calling home office ip phones, the background noise is heard at headoffice only, at home office side it is good.
i couldn't figure out where it is going wrong.
the setup is like
IP Phone------> call manager------> gateway(cisco 1940)------->internet----------> homeoffice router(cisco881)--------->ip phone.
the home offices are connected over DMVPN tunnels. and the bandwidth is 1 MB for the tunnels.
attaching router config for head office gateway and home office router

Hi Abhijit,
thank you for the reply,
its some kind of crakling sound.
we are using 6921 at home office side and 8941 and 6921 at headoffice side, but i found no issue with phones,these are working fine in internal network, when i did .mute the phone at home office side, there is no sound on head office side..
is there any problem with the encryption used on tunnel, i applied qos for the voip but found no difference..
please can you help me...

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