User`s manual

Appendix B Specifications
73
`DTMF Tone Frequency
Low Group Frequency (Hz)
697 770 852 941
1209 1 4 7 *
1336 2 5 8 0
1477 3 6 9 #
High Group
Frequency (Hz)
1633 A B C D
*Specification and features subjects to change without notice.