PSTN lines have significant limitations regardless of whether they are 13xx or local calls.
If there is a break in the line anywhere between the client and the monitoring station, including street wiring, pillars, exchanges etc. it's game over.
Securidial services offer some useful maintenance privileges at the monitoring centre end (i.e. when their inbound lines stop functioning at an unfriendly hour) however this doesn't extend to client premises. There have always been myths about 'higher quality service' etc. or the ability to redirect traffic, but this was usually smoke and mirrors to distract from the real benefit to security companies: Rebates and revenue sharing on calls to those numbers.
If the call costs are an issue, suggest they stop incurring them and move towards IP monitoring.
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