For one you'd think that the point of termination of the call would have to be near the place where the crime is supposedly taking place. If that's not the case then the default should not be to go in with guns blazing but to use the time in flight to further verify the veracity of the report.
After all, what are the chances of someone reporting a hostage situation from a point of termination in another country, state, county or even town from where the hostage situation is taking place? Such information should be treated as hearsay at best.
Why do you think they can tell? I doubt they can tell the difference between Ooma users, let alone the difference between an Asterisk user on that block versus anywhere else.
Also, I hope they don't go in guns blazing regardless of the report. A troublemaker could just as well be on the block as elsewhere.
After all, what are the chances of someone reporting a hostage situation from a point of termination in another country, state, county or even town from where the hostage situation is taking place? Such information should be treated as hearsay at best.