In the dial plan, 8+3 digits is a different scenario than 8+10 digits, and
acceptable.  Additionally, a dial plan of three digits exactly 911 would be
different as well, and acceptable.

If you had an access code of 81 and 82 and then three digits to dial two
offsite systems, that wouldn't necessarily be a conflict with dialing 8+ 3
digits for local voicemail.

I would agree the system should throw an error when two dial plans are the
same.  But just because 8 is used at the beginning of two dial plans doesn't
necessarily make it wrong, or unacceptable.  I think if you further define
your dial plans, and make sure they are in the correct order things will
work differently.   

-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of Kumaran
Sent: Thursday, January 06, 2011 10:51 PM
To: [email protected]
Subject: [sipx-dev] Dial Plan--PSTN Prefix

Hi All
          While working on Dial plan through unmananged gateway,I 
changed the PSTN prefix as 8 from 9 and the emergency is same 911. When 
i Dial 911 the call is landed on unmanaged gateway.But i tried 8911 the 
call is connected IVR(voice mail inbox of 911)  and played the prompt  
that user extension not valid. Soo working wise its correct because 8 + 
Ext is Voicemail inbox prefix.But my question is why SipXconfig is not 
throwing a error message  when changing  PSTN prefix  to 8 because 
prefix 8 is already Voicemail inbox prefix. It also reflecting in linux 
console as -<userPattern>8811</userPattern>
Regards
Venkateshwaran T
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