You really have no basis for speculating about what may or may not be valuable intelligence from any given wiretap.
You have to know what intelligence already exists or what seemingly innocuous clues terrorist operatives may give, since they are generally not known to be geniuses. You don't know what, if any codes or lexicons had already been cracked by our guys prior to the call.
Sometimes, the mere fact that a confirmed phone call took place is enough to have value.
Hey, Hey! Enough of that talk.
We don't need to be giving out information like that.