So what are the "issues" that the panel is reporting?

Loss of Dial Tone, or Communication Error?

Had a burglar alarm which was fed on the return of the fire alarm's secondary dial tone, which could not communicate. Using a Sidekick, on the stress setting, saw a HUGE difference between the Telco side and the return from the fire alarm. Luckily, they had a copper Fax line that they could move the burglar alarm to, and leave the fire alarm with both lines dedicated.