CounterPath Bria iPhone Edition User Guide (Revision 2) - Manual (Page 36)

CounterPath Corporation
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Advanced Dial Plan: Subsequence Substitution
The feature is supported only on devices running on iOS4.
The match pattern can include a sequence of numbers to match and another sequence to substitute for the match.
This feature is useful if you want to convert a sequence within the input, not just add or remove a prefix.
The syntax is:
<input sequence : substitute sequence>
For example: <604:250> means change the sequence “604” to “250”.
The sequence substitution element can be combined with any other elements in the match pattern. For example:
+x.<604:250>x. would change match +6045551212 and +16135556040 and in both cases change the “604” to
“250”.