asterisk users - Sep 2011 - PARAMETERS FOR DID'S FROM TELCOM AND ASTERISK TO SYNC

Hi list,
I have 20channels PRI line from Airtel. and I have 30channels digium PRI
card. and I am using asterisk1.4 with goautodial.
I need to configure DID's for every extension with sip.
which Parameters need to add in asterisk and which parameters enable from
Airtel PRI line for this DID's. can you help me .
Best Regards,

Mahesh Katta
*BUZZ**WORKS* Business Services Private Limited
BANGALORE | CHENNAI | HYDERABAD | MUMBAI| DELHI
201, Crystal Tower, 75 Gundavali Cross Lane, Andheri Kurla Road, Andheri (E)
Mumbai 400069
GSM +91.97029.70779 | Phone +91.22.4229.2634 | Fax +91.22.4229.2634
Web http://www.buzzworks.com
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On Tuesday 06 September 2011, mahesh katta wrote:
> Hi list,
> I have 20channels PRI line from Airtel. and I have 30channels digium PRI
> card. and I am using asterisk1.4 with goautodial.
> I need to configure DID's for every extension with sip.
> which Parameters need to add in asterisk and which parameters enable from
> Airtel PRI line for this DID's. can you help me .
When an incoming call arrives from the ISDN line, look in ${EXTEN} -- this 
will contain some representation of the number.  It may be missing the STD 
code, or just the initial 0.

All* you need to do is implement a rule to translate the incoming ${EXTEN} on 
an incoming call, to an extension number, and implement this in your dialplan 
in the conjtext in which calls arrive from the PSTN.  For example, if you 
always want the "internal" number to be "2" followed by the
last 2 digits of
the "external" number, you could use this minimal example:

[from-pstn]
exten => _X.,1,Set(LAST_TWO=${EXTEN:-2})
exten => _X.,n,Dial(SIP/2${LAST_TWO})
exten => _X.,n,Hangup()

[*] OK, that's not *quite* all.  When you make an outgoing call, you need to
set the caller ID to match the "external" number the person needs to
dial to
call you back:

[outgoing]
exten => _X.,1,Set(LAST_TWO=${EXTEN:-2})
exten => _X.,n,Set(CALLERPRES()=allowed)
exten => _X.,n,Set(CallerID(num)=${PREFIX}${LAST_TWO})
exten => _X.,n,Dial(${ISDN}/${EXTEN})
exten => _X.,n,Hangup()

${ISDN} and ${PREFIX} need to be defined in the globals section:

[globals]
ISDN=DAHDI/g1
PREFIX=013322689
; this assumes numbers start (01332) 2689xx


-- 
AJS

Answers come *after* questions.