asterisk users - Sep 2005 - (OT) Dialplan Standards for Business/Offices

Are there any standards for setting up pbx dialplans for businesses/offices?
 What I mean is that, which numbers are reserved for a specific use ex. 0 
for operator ? Putting Zero for operator in the dialplan seems to be the 
common practice of businesses.
 If there is such a standard, * and # are used for what ?
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I haven't seen any "standard" for * and # usage. There are a
number of
standards depending on what country you are in for numbers. For instance, 
011 is reserved for international dialing in US. But for most standards like 
that, you should consult your PSTN provider to make sure that you're sending
them the correct info. 
 One recommendation is to be sparing on # unless you know what phones are 
going to be using your system as some use that to signal that the person is 
done dialing or like an enter key. I even met a Linksys that wouldn't let me
use the *. 
 Another recommendation is that you check with the businesses/offices that 
you will be servicing to see what they are used to so they will not have to 
change. For instance, if you are planning on providing an audio last caller 
id readback extension in my area, you should use *69.
 Looking online...I see the codes used by Sipura (by default):
*69 Call Return
*98 Blind Transfer
*72 CFWD (all) activate
*73 CFWD (all) deactivate
*90 CFWD (busy) activate
*91 CFWD (busy) deactivate
*92 CFWD (no answer) activate
*93 CFWD (no answer) deactivate
*66 Call Back Activate
etc...
 Quote from a cisco page: 
http://www.cisco.com/univercd/cc/td/doc/cisintwk/intsolns/voipsol/dp3_isd.htm
A dial plan is a numbering plan for the voice-enabled network. It is the way 
that you assign individual or blocks of telephone numbers (E.164 addresses) 
to physical lines or circuits. The North American telephone network is based 
on a 10-digit dial plan consisting of 3-digit area codes and 7-digit 
telephone numbers. For telephone numbers located within an area code, a 
7-digit dial plan is used for the Public Switched Telephone Network (PSTN). 
Features within a telephone switch (such as Centrex) support a custom 
5-digit dial plan for specific customers that subscribe to that service. 
PBXs also support variable-length dial plans, containing from 3 to 11 
digits.
 On 9/8/05, KRTorio <krtorio@gmail.com> wrote: 
> 
> Are there any standards for setting up pbx dialplans for 
> businesses/offices?
>  What I mean is that, which numbers are reserved for a specific use ex. 0 
> for operator ? Putting Zero for operator in the dialplan seems to be the 
> common practice of businesses.
>  If there is such a standard, * and # are used for what ?
> 
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