How To Remove PREFIX ... ??

Dikic

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#1
Hi guys, we are haveing some problems with prefixes when we use call forwarding or follow me, bellow you can find eloboration of a problem, please advise if you have any idea!!

Our standard implementation implies prefix for PSTN calls (9 or 0,
mostly 0, but
for this case study it is 9).

In order to make redial/callback on phones possible without editing call
(incomming,missed or not) there are 2 possibilities for prepending prefix to
callerID on to the incomming call:

1. on the phone itself (in the call list)
Linksys diaplan pattern substitution <dialed:replaced> i.e. <900385:385>xxxxxxxx.
meaning remove 900385 and add 385 to 7+ digit pattern...

Cisco 7xxx phones seem to lack this ability to manipulate dialed strings.

2. on the PBX (FreePBX, Elastix, Trixbox) just before forwarding call to
the phone

3. on the PBX (FreePBX, Elastix, Trixbox) in custom context during the
"entrance"

[from-trunk-custom]
exten =>_X.,1,NoOp(===========================================================)
; include => from-sip-external
;exten => _X.,2,DumpChan()
exten => _X.,2,NoOp(mc++: Prepending 900 to ${CALLERID(num)})
exten => _X.,n,Set(CALLERID(num)=900${CALLERID(num)})
exten => _X.,n,Goto(from-trunk,${EXTEN},1)
; last line could be replaced by (mc++ todo test)
; include => from-trunk

Scenario:
As long as there is no call forwarding and FollowMe everything is OK. As
soon as someone forwards call, or FollowMe rule call let say external number we have
original inbound callerID (385 91 xxx yyyy) prefixed with 900 (900 385 91 xxx yyyy) and some mobile operators also prepend additional +385 to the number.

Case A:
Inbound routes end on some RingGroups which ring internal SIP and IAX
ringgroups and external mobile phones, so

Extension List (x, y some numbers):
xxxx5
xxxx1
9091xxxyyyy#

Solutions:
1. do not prepend on the PBX

Problems with above solutions:
1. no IP phone found with option od add prefix to the CallerID on the lists
2. it seems that this could be made with custom device, but having project
with 250 phones this is not much fun...


Problems:
In the asterisk CLI ring group is implemented through dialparties.agi,
dial-macro as:

Dial(xxxx5@from-internal&xxxx1@from-interal&9091xxxyyyy@from-internal)

So it seems to remove 900 on the incomming callerID one should "intercept"
from-internal context with custom one.

Is this possible with replacement in
General settings > Default context
replacing "from-internal" with "from-internal-custom"

[from-internal-custom]
exten => _X.,1,NoOp(-----------------------------------------------------------)
exten => _X.,2,NoOp(mc++: Removing 900 from ${CALLERID(num)} to ${CALLERID(num):3})
exten => _X.,n,Set(CALLERID(num)=${CALLERID(num):3})
exten => _X.,n,Goto(from-internal,${EXTEN},1)


What would be the best solution for this problem?


Regards
Holisticware team
 

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