we want to append in start four digits with every incoming number and we want 
to display only four digits on those calls whose comes with alphabets. We set 
the following rules

exten => _X!,1,Set(CALLERID(num)=1666${CALLERID(num)})
exten => _X!,1,GotoIf($["${CALLERID(num)}" = "Unknown"]?changeCLI)
exten => _X!,s(changeCLI),Set(CALLERID(num)=1666)

these rules works fine for numeric cli but if we get abcd in cli then calls 
goes with ‘1666abcd’ and our carrier rejected that call because they only 
accept numeric cli. We just want to send 1666 instead of 1666abcd.

thanks in advance and your prompt reply will be highly appreciated.

 

 
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