Answer: Because this is what the rule is configured to match. syntax = /match/ /change/
2. why the rule is specific for no 987654.
Answer: Because there is no regular expressions like beginning "^" or ending "$" or set (/ etc.
Whoever created that rule wanted to match exactly those numbers. If he/ she had wanted to match other numbers, then he/she would have used regular expressions.
Say for instance. I want to match anything after "9" then it will be something like
rule 1 /9…../ // notice I used dots (regular expression). That way anything starting with 9 and any other numbers will match.
3. why should anyone call 987654 ( infact he/they having so many choices for dialing random no).
Answer: why? This is best answered by the rule creator. He must have had a thought process. It comes back to design. The VOIP network this rule is in has a purpose for that "match" with the design. I cannot answer this question. No one can without knowing what the designer wanted to achieve or knowing the VOIP network requirement. One thing we do know is that he/she wanted to match those exact numbers.
Now where this rule is applied might not only be for dialed numbers (called), it could have been for caller-ID (calling) numbers.
Overall i am looking for logic behind the rule for 987654 digit only.
Answer: Logic behind the rule is to match the numbers exactly, and translate them.
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