Dial Plans Decoded

parenthesis enclose the dial plan
pipe means OR
represents a digit between 0 and 9
period means that the preceding element can be repeated many times
signifies a subset
e.g. ([2-9]xx[2-9]xxxxxx) = only numerical values between 2 and 9 are allowed to precede the two digits and the following six digits
Item blocked!
e.g. (411!|xxx|1900xxxxxxx!|1[2-9]xx[2-9]xxxxxx) = no 411 or 1900 numbers allowed in the dial plan
< : >
< “optional value” : “substitution element” > “sequence to be matched”
Example: adding 714 to a 7-digit sequence – < :714>xxxxxxx
Send preceded value(s) immediately when a pattern is matched, bypassing the default Interdigit Short Timer delay 

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