If its fxo, you are telling your GW what digits were sent.  If its a PRI, typically 4 digits are sent, but they can send 3 or all 10 if we're talking about NANP. 
Sent from handheld 
On Apr 7, 2012, at 5:04 PM, "Iam Here" <go_soon2010_at_hotmail.com> wrote:
> Thanks for your answer what about if it's FXO not PRI
> 
>> From: carl.gosselin_at_altizone.com
>> Date: Sat, 7 Apr 2012 17:00:09 -0400
>> Subject: Re:
>> To: go_soon2010_at_hotmail.com
>> CC: ccielab_at_groupstudy.com
>> 
>> The number of digits sent from the PSTN have nothing to do with the
>> configuration at GW1.
>> 
>> It depends of the service offered. If the incoming lines are analog,
>> no digits are sent. Only electric handling is done to go offhook. If
>> the service is digital, BRI or PRI then it will depend on the service
>> provider basic service offer, it can very from 4, 7 or 10 digits in
>> North America.
>> 
>> In any case you'll have to talk with your service provider.
>> 
>> You may also run debugs in order to see what settings are used.
>> 
>> debug isdn q931 is always usefull.
>> 
>> Goodluck
>> 
>> -Carl
>> 
>> 
>> ==============================
>> Carl Gosselin CCIE R&S Voice #15228
>> 
>> On 2012-04-07, at 16:33, Iam Here <go_soon2010_at_hotmail.com> wrote:
>> 
>>> GW1 -------PSTN -------GW2
>>> 
>>> 
>>> the config of GW1 is as the following
>>> 
>>> !
>>> dial-peer voice 200 pots
>>> destination-pattern 87362...
>>> prefix 14155562
>>> port 1/0:23
>>> 
>>> 
>>> I'd like to know how many digits will the PSTN send to GW2
>>> 
>>> 
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Received on Sat Apr 07 2012 - 21:22:32 ART
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