[asterisk-users] Should I remove the blank options?

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Hi all,

I am very new to asterisk and I am just looking through the config files 
to try and understand them a bit.
In my zapata-auto.conf file I have
; Span 2: WCTDM/1 "Wildcard TDM400P REV I Board 2"
;;; line="5 WCTDM/1/0 FXOKS (In use)"
signalling=fxo_ks
callerid="Channel 5" <6005>
mailbox=6005
group=5
context=from-internal
channel => 5
callerid=
mailbox=
group=
context=default

Is there any reason I have two callerid mailbox group and context? 
Should I remove the second lot.
Also both contexts are defined one as from-internal and the other as 
default will this cause a problem if left?

Thanks
Kate