phones dial string

Dear Snom technical support,

I am writing to request assistance with a deployment of around 80 D717 and D735 phones.

The PBX is a Grandstream UCM 6308 running the lates official firmware, the phones will be running firmware 10.1.159.12. The assistance I require is with the phones dial string, since the client has requested to dial the number and not have to press the check/ok button, and also with BLF settings.

In our country (Greece) we have short codes begging with 1 and a length from 3 to 6 digits. My issue is when I use the following dial string 

"!^(1[0-9]{2,5})$!\1@\d!d"

I am unable to dial for example 181818 or 11811. If split up the dial string in to individual parts like so,

"!^(100|166|199)$!\1@\d!d"
"!^(10[1-9][0-9])$!\1@\d!d"
"!^(15[0-9]{2})$!\1@\d!d"
"!^(1[134][0-9]{3})$!\1@\d!d"
"!^(18[0-9]{4})$!\1@\d!d"

I am able to dial the respective numbers without pressing the check/ok button, accept the 5-digit variant of 18 where I have to press the check/ok button. I have set the US dialing number format to off.

How would I go about implementing a correct dial string for these numbers.

As for BLF, in a test environment of 5 phones I have configured function key 3 with the following string

<sip:3501@192.168.1.200;user=phone>

and the following parameters via xml (will set them also via SRAPS)

Control green LED
AVAILABLE AVAILABLE_ON_MOBILE AVAILABLE_AT_DESK I-Am-Ready I-Am-Almost-Ready seized_local alerting_local active_local held_local

Control LED
ON IN_A_CALL CALLING IN_A_MEETING URGENT_INTERRUPTIONS_ONLY BUSY I-Am-Busy DND_ALL DND_SELF ACTIVE INACTIVE BE_RIGHT_BACK SEIZED CONNECTED ON_HOLD OFFHOOK RINGBACK I-Am-Ready AWAY AVAILABLE AVAILABLE_ON_MOBILE AVAILABLE_AT_DESK call_center_status_empty PhoneHasCall PhoneHasMissedCalls CurrentIdentityHasVoiceMessages PhoneHasVoiceMessages seized_local seized_remote active_local active_remote dialog_dnd

Control orange LED
AWAY INACTIVE BE_RIGHT_BACK KeyConfigActive dialog_dnd

Control red LED
BUSY DND_ALL DND_SELF I-Am-Busy IN_A_CALL IN_A_MEETING URGENT_INTERRUPTIONS_ONLY UNAVAILABLE seized_remote alerting_remote active_remote held_remote

Fast Blinking Led
RINGING

Medium Blinking Led
HOLDING

Slow Blinking Led
AWAY

The BLF will stay lit with the green led at all times.
Are there any other settings I have to change/set in the phone to have BLF working correctly.

Thank you for your time.

Sincerely