Heritage02Rider,
That will teach me to try and explain from memory, especially since I am not getting any younger, and you are correct it is Operations not Tools to get to the error logs; at least you found them and that is what matters.
Now, I don't know what kind of pipe you have at both ends between the US and Mexico, but let's just try a little experiment with your codecs before you start changing a lot of stuff around.
According to your Network Diagnostics File you are running G.711 for your remote phones so let's knock that down to G.729 and see if the frequency at which this happens either lessens or goes away all together; I will bet on it being reduced with some instances still occuring.
Go to System > IP-Related Information > IP Connections > Remote {or whatever your Mexico Phones are using}
Now, that I look at your Diagnostics again it looks as though you may have you Mexico Phones as local phones since it is showing 2 audio frames per packet. Hmm, you may just want to change your Mexico Phones over to the Remote IP Configuration or at least seperate them from the Local ones so you can change the Codec without affecting all the local phones as well. If you need help with this let me know and I can walk you through it.
Thanks,
TE