Anyone who sees those indistinctly marked similarly equipped buildings next to telco COs knows that the NSA is always watching.
there is so much encrypted traffic these days that the signal:noise is not going to be much better than unencrypted, assuming they have the equipment to crunch it, which they may or may not. Long keys, random/arbitrary filler, one-time-pads, etc. all help, and if you don't know about those you are well-advised to learn as they are time-tested and effective, particularly in combination.