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Noise in call over GRE Multipoint tunnel

Hi all,

we have a setup connecting home office to head office over GRE tunnel.

we connected ip phone at Home office side which gets registered to call manager at head office, data traffic is fine but when we call head office to home office or vice versa, we are getting noise in the call heared at head office side , when i did mute the home office phone i am not hearing the noise.

i doubt the voice traffic getting effeted over tunnel.but unable to troubleshoot, please can anyone help me....

the call flow is like

IP phoen 1----->cucm----->gateway------>wan------->home office router--------->ip phone 2

attaching the router configs for gateway and home office

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