[cisco-voip] how to mask internal extension !

[Cisco Voip]

Hi all experts.
 
I will be thankful if some one can guide me whats going on in my scenario. Pls 
dont be scared with such a long post.
 
Following is my diagram
 
(ext 
1001)CIPC----------------R1---------------------------R2--------------------CIPC(ext
 2001)
 
I am running CME on both R1 and R2 with just one CIPC registered to each. Now i 
made the following dial-peers on R1 and R2
 
R1
dail-peer voice 2001 voip
destination-pattern 2...
session target ipv4:172.16.1.2 (R2's IP)
 
R2
dail-peer voice 1001 voip
destination-pattern 1...
session target ipv4:172.16.1.1 (R1's IP)
 
Now i made the call from 1001 (and vice versa) and call was successful. Now what 
i wanted to do
 
1) When the call is made from 1001 to 2001, calling-number should translate to 
0213561000. For this i configured
 
On R1:
 
voice translation-rule 1
rule 1 /1001/ /0213561000/
 
voice translation-profile Calling-number
translate calling 1
 
dial-peer v 1001
translation-profile outgoing Calling-number
 
Now when i made the call from 1001 to 2001, i can see on 2001 that the call is 
coming from 0213561000. Again successful !
 
Now  this is the problem part. I want to dial 0213561000 from 2001, and in  
background it should be translated to 1001. I configured the following
 
on R2:
 
dial-peer voice 1 voip
destination-pattern 0213561000
session-target ipv4:172.16.1.1
 
on R1
 
voice translation-rule 2
rule 1 /0213561000/ /1001/
 
voice translation-profile Called-number
translate calling 2
 
dial-peer voice 1 voip
incoming called-number 0213561000
translation-profile incoming Called-number
 
Now when i dial 0213561000 from 2001, it makes the call and suddenly on display 
it changes to 1001 !!! Why is this so ?
 
I  did some research and changed the protocol to sip. Now using wireshark,  i 
was clearly able to see that 1001 was send as remote-party-id. But  how to solve 
it in H323 environment ?
 
To  put it simple, i want to mask my internal extensions, so that when the  call 
is made from 2001 to 0213561000. the display should also show  0213561000 and 
not 1001.
 
Pls guys, take out some time to help me out.
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