Probably it is a bug
There is no place in the settings where I add 1 in the beginning before +
Then file a bug report and get shot down , NOTHING arbitrarily adds the 1 you are seeing.
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check your dial plan to make sure you are not adding the “1” in there. You played so much with the settings that you might have put it there and forgot about it.
something like this would do it
exten => _X.,n,Macro(dialout-trunk,3,1${EXTEN},)
exten => s,23,Dial(${OUT_${DIAL_TRUNK}}/1${OUTNUM}${OUT_${DIAL_TRUNK}_SUFFIX},${TRUNK_RING_TIMER},${DIAL_TRUNK_OPTIONS})
it is was changed in extensions_override_freepbx.conf by my predecessor,
many thanks