Hi,
Without separate incoming and outgoing context you could not secure your
system from an outside caller using your system to dial a long distance
number.
Here is an example outgoing context that restricts who can call long
distance. If a SIP phone does not belong to the 'longdistance' context
they can only make 'local' calls through the ZAP trunk, likewise if a
outgoing ZAP channel is in the 'local' context it can only make local calls:
**Outgoing.incl****
[local]
ignorepat => 9
exten => _9NXXXXXX,1,Dial(${OUTBOUNDTRUNK}/${EXTEN:1})
exten => _9NXXXXXX,2,Congestion(5)
exten => _9NXXXXXX,102,congestion(5)
exten => 911,1,Dial(${OUTBOUNDTRUNK}/911)
exten => 9911,1,Dial(${OUTBOUNDTRUNK}/911)
include => default
[longdistance]
ignorpat => 9
exten => _91NXXNXXXXXX,1,Dial(${OUTBOUNDTRUNK}/${EXTEN:1})
exten => _91NXXNXXXXXX,2,Congestion(5)
exten => _91NXXNXXXXXX,102,congestion(5)
include => local
*********
** SIP.conf**********
...
[general]
srvlookup=yes
Callgroup=1
pickupgroup=1
;SJphone
[410]
context=longdistance
;canreinvite=no
type=friend
username=410
secret=passwd410
callerid=<410>
qualify=yes
nat=no
host=dynamic
[EMAIL PROTECTED]
disallow=all
allow=gsm
allow=ilbc
allow=ulaw
allow=alaw
dtmfmode=rfc2833
Callgroup=1
pickupgroup=1
;Zyxel - P2000WV2
[411]
context=longdistance
canreinvite=no
type=friend
username=411
secret=passwd411
callerid=<411>
nat=no
host=dynamic
[EMAIL PROTECTED]
disallow=all
allow=ulaw
allow=alaw
dtmfmode=rfc2833
Callgroup=1
pickupgroup=1
....
*****
and finally
***zapata.conf*******
[trunkgroups]
[channels]
musiconhold=default
echocancel=yes
echocancelwhenbridged=yes
echotraining=yes
usecallerid=yes
hidecallerid=no
callwaiting=no
threewaycalling=yes
callwaitingcallerid=yes
transfer=yes
immediate=no
faxdetect=both
context=default
signalling=fxs_ks
group=1
channel => 1,5,6
context=default
signalling=fxs_ks
group=4
channel => 2
context=local
signalling=fxo_ks
group=2
channel => 3
context=longdistance
signalling=fxo_ks
group=3
channel => 4
********
As you can see above the outgoing context limits which phones have
access to longdistance lines. The incomming context cannot match the
outgoing or you will have on hell of a security problem...
I hope this example helps explain what I am talking about.
Thanks
Andrew Kohlsmith wrote:
On Tuesday 21 March 2006 12:25, Aaron Daniel wrote:
Yeah, I agree with Chuck. User's on our system are put into various
contexts depending on who they can call... local, long distance, or
internal only.
And *all* of those people are placing calls *in* to asterisk to get into those
contexts. :-)
When you pick up a telephone wired into an FXS port; asterisk sees an incoming
request for dialtone.
When you pick up your SIP phone and dial; it must match a friend or user entry
or you'll never get in.
When your IAX softphone client makes a call, again, it must match a friend or
user entry.
These are *all* incoming calls as far as Asterisk is concerned. You get
dumped into a specific part of the dialplan (the context specified) and you
tell Asterisk what they can dial. Internal extensions, external peers, Zap
channels or even applications... the second half of all of this is the
outgoing part, when Asterisk Dial()s.
-A.
-A.
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