That was a Coast Guard boat doing radio checks with Iqaluit at the time. From what I recall, they actually called the centre and talked to each other. It was when they were setting up the new equipment.
As the Coast Guard stated earlier, they said that the new equipment wouldn't be released until these problems were solved. Well, the recording shows that it was released before the problems were solved. That's when they first noticed them.
The problems are still occurring in Prince Rupert, and when Comox is moved to Victoria, they're concerned that they'll have the same problems because of landlines.