Yes Peter, I know what this is.
As correctly stated by Okkie, they send a * or # command to the CO, avoiding matching short code in the IPO.
**N / Dial / K*NI
*#N / Dial / K#NI
Phone goes off hook after the second key, then sends the dialled commands as an Information Packet.
Example:
CO command *21*N# diverts the line at the far end.
CO command *61*N# diverts inbound calls after 20 sec.
If you are using mobile twinning call control, you will get a warning about the **N.
This feature could probably be useful if there is only one line going in to the IPO.
Kind regards
Gunnar
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Hippos have bad eyesight, but considering their weight, it’s hardly their problem