only 63 DTMF characters that include digits, '*', '#' and meaning characters that include 'x', '.', '|' and characters of range format that include '~', ',' and brackets ('[', ']') are allowed. Note: 'x' represents any digit character '.' represents one or more repetitions of character or range that precedes it, can't use in brackets '!' represents the user-dialed number can be rejected by placing '!' at the end of the pattern '|' to connect next sub-pattern '[' and ']' must pair and nest brackets is illegal '~' and ',' only show in brackets '~' connected characters must be digit User should make sure to create unique pattern for each SIP proxy server. The VOP1248G-61 is not able to distinguish between dial plan tables if they have the same pattern.