asterisk users - Jan 2005 - Extension No.s not being received correctly.

We have the following problem with our asterisk system:
 
We have a very long no. 089xxxx3168205 (14 digits) or perhaps minus the 1st
3 digits as that is the area code.
 
Some people are having issues when they phone from certain PABX?s or have to
try many times to get through, which is really bad.
 
I have noticed from my mobile this does not occur.
 

pbx*CLI>
    -- Extension '2' in context 'default' from
'89xxx990' does not exist.
Rejecting call on channel 0/2, span 1
    -- Extension '2' in context 'default' from
'89xxx990' does not exist.
Rejecting call on channel 0/3, span 1
 
Connected to Asterisk CVS-HEAD-08/12/04-11:15:45 currently running on pbx
(pid = 10835)
    -- Remote UNIX connection
pbx*CLI>
    -- Executing Dial("Zap/4-1", "SIP/7960c1|30|tr") in new
stack
    -- Called 7960c1
    -- Accepting call from '89xxx990' to '205' on channel 0/4,
span 1
    -- SIP/7960c1-5287 is ringing
 
What I can see from the above is that it seems to be cutting off the last 2
digits but then suddenly gets through on the third attempt.(extension 2 does
not exist)
 
We use 3 digit extension no.s
 
Any ideas, any help would be very much appreciated.
 
Thanks.
 
Matt Oulton.

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