| I'm in the UK, so software may be slightly different - also, you don't mention the system type, so i'll assume it's a DK280...
The reason the 601 code works is because it is a Call Forward All Calls, therefore there is no 'timer' required.
When entering 604 (forgive my lack of 'hash', but i can't find it... wrong type of keyboard!) the system needs two separate parameters.
These are the Destination Number and the No Answer timer.
i.e. SPKR, HASH, 601, DESTINATION NUMBER, SPKR
will call forward all calls.
Where as...
SPKR, HASH, 604, DESTINATION NUMBER, SPEED DIAL, DELAY IN SECS (12 is usual), REDIAL
is required to set a Call Forward if Busy or Not Answered after 12 secs |