Inbound Caller ID Reformatting Rule Parameters

Inbound caller ID reformatting rules rewrite the number shown on an incoming call before it reaches your extensions, so you can drop unwanted leading digits or add a prefix of your own. When you export these rules, or build a CSV to import them in bulk, each row is one rule described by the columns below. Use this reference to complete every column correctly.

Field reference

Column	What it does	Required	Accepted values	Default
Patterns	Defines the caller IDs the rule applies to. Any inbound caller ID that matches the pattern is reformatted according to the other columns.	Yes	Digits, letters, and the characters `[` `]` `*` `#` `(` `)` `.` `-` `+` `!`. Up to 31 characters.	N/A
Strip	The number of digits to remove from the start of the matched caller ID.	No	Digits only. Up to 2 characters.	N/A
Prepend	The digits to add to the front of the caller ID, applied after any stripping.	No	Digits, letters, and the characters `(` `)` `.` `-` `+` `*` `#`. Up to 31 characters.	N/A