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Here is how it works. When setting up a BLF key with Yealink we configure 2 parameters:

1- The extension number to monitor

2- The call pickup code (*87 on our platform).

Now the phone is provisioned. The following scenarios are possible:

1 – the lamp will show the status of the monitored phone

2 – Pressing the BLF key while the monitored user is NOT on the phone will cause the BLF key to behave like a speed dial (simply dials the extension)

3 – Pressing the BLF key while the monitored user IS on the phone will cause the BLF key to behave like a speed dial (simply dials the extension – same as above)

4 – Pressing the BLF key while the monitored user’s phone is ringing will cause the BLF key to dial the pickup code+extension (*87xxxx). This allows you to remote answer the ringing phone.. it is normal and the expected behavior with yealink.

So, the *87 in the configuration is for remote pick ONLY. It is not used in any context other than the monitored phone is ringing