Ringing BLF dials extension twice

[jolouis]

Sounds like you have your DSS key mis-configured. BLFs can double as call pickup buttons, so if you have 1001 configured in both the "value" and "extension" fields. I believe the value field defines which extension the BLF will monitor/call, and the "extension" field defines the code to be sent when trying to do a call pickup (i.e. hitting a BLF that is showing a ringing extension).

Make sure the "extension" field is left empty and see if that solves the problem.