What audio tones could I expect to hear on BT land...

Subject says it all really. But in the interests of clarity: I subscribe to no caller id, caller waiting or other such services but more and more often my phone calls are interrupted by pairs of identical audio tones approx. 0.5 seconds apart and repeated at, perhaps, 20 or 30s intervals. Not having a frequency meter I can't determine the actual tone frequency but it is a low to medium frequency rather than high - not a whistle. The other party's voice is cut when the tone is present but they cannot hear the tone. The common factor is my line - not who I am speaking to. And I can't remember if it occurs only when I have initiated the call. TIA Richard

bfg wrote:
Hi Strugglin,
I would want to rule out my phones from causing the noise (is it like the dialling tones for a particular number?) i.e ayour phone dialling a number during the call.
Erm, thanks for your reply Bfg.  I had hoped that my description was adequate.  The noises - sounds really - are pairs of mid frequency tones separated by about 0.5s repeated at about 20 or 30s intervals.  They are what I would expect to hear if I had call waiting or BT Answercall or any other 'add ons'.  They are not unlike the call waiting signal on a mobile telephone.  They are not the sound of pulse or tone dialling superimposed on a voice call.
I'm not sure that I can bear the thought of logging a fault with BT.

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