[asterisk-users] Can't call my Extensions HELP!

[Tariq ..]

Greetings.. 
i have 20 extensions with two queues.. i have members in the queues as SIP/xxxx
now recently i have noticed that users are unable to call each other.. this is causing me a headache..
calls comming to the queues are forwarded smoothly to the users.. but they can't call eachother.. what is going on??
i'm using Asterisk 1.4.19-1 with FreePBX 2.4.0.1
my SIP.CONF settings are
------------
[3000]
type=friend
secret=3000
record_out=Adhoc
record_in=Adhoc
qualify=yes
port=5060
pickupgroup=
nat=yes
mailbox=3000 at device
host=dynamic
dtmfmode=rfc2833
dial=SIP/3000
context=from-internal
canreinvite=no
callgroup=
callerid=device <3000>
accountcode=
call-limit=1
busy-limit=1
----------------
 
 
my Extensions.conf are like this
 
-----------------
 
[ext-local]
include => ext-local-custom
exten => 3000,1,Macro(exten-vm,novm,3000)
exten => 3000,n,Hangup
exten => 3000,hint,SIP/3000
 
[from-did-direct-ivr]
include => from-did-direct-ivr-custom
exten => 3000,1,ExecIf($["${BLKVM_OVERRIDE}" != ""],dbDel,${BLKVM_OVERRIDE})
exten => 3000,n,Set(__NODEST=)
exten => 3000,n,Goto(from-did-direct,3000,1)
 
-----------------
 
my queues.conf 
------------------
[8000]
announce-frequency=0
announce-holdtime=no
eventmemberstatus=no
eventwhencalled=no
joinempty=yes
leavewhenempty=no
maxlen=0
periodic-announce-frequency=0
queue-callswaiting=silence/1
queue-thereare=silence/1
queue-youarenext=silence/1
retry=1
strategy=random
timeout=5
wrapuptime=0
member=SIP/3000,0
 
 
 
please help! i know i was able to call from an SIP to another SIP .. now i can't!
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