Called Party Answer (CPA) / Line Reversal

Hi - is there any reason why the Called Party Answer (CPA) service can only be applied to Business and not Residential lines. SPM/MPF used to be available on Residential sub's lines - seems weird that its replacement (CPA) can only be activated on Business Lines ?

monolog99 wrote:
Hi - is there any reason why the Called Party Answer (CPA) service can only be applied to Business and not Residential lines. SPM/MPF used to be available on Residential sub's lines - seems weird that its replacement (CPA) can only be activated on Business Lines ?
This is a Customer to Customer forum, so messages do not go to BT.
I may be able to give you some idea why.
CPA was a hangover from the days of Strowger mechanical exchanges and was implemented on subsequent exchange designs to maintain compatibility with some legacy products that relied on a physical line reversal to detect when a call was answered.
Modern equipment, like answering machines, can simply detect the network tones to determine when a call has been answered, so this facility was not implemented on residential lines.
Some business lines still have legacy equipment connected to them, like older switchboards(PABX), that require line reversal. Also they may have payphones which need this facility.
So this facility has been retained for business lines until such time as all the legacy equipment has been replaced. From what I remember, this has to happen before full implementation of the 21CN network, whenever that may be.
I hope that is of some help. Was there any reason why you were asking?
There are some useful help pages here, for BT Broadband customers only, on my personal website.
BT Broadband customers - help with broadband, WiFi, networking, e-mail and phones.

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