Cisco ATA186-I1 Installation And Configuration Manual page 120

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Cisco ATA 186 Installation and Configuration Guide
C-2
bits 6-7 mask 0xc0: HookflashMethod:
0=disable sending hookflash
–
1=by negotiation
–
– 2=always send hookflash
3=use Q931 to send user keypad input (DTMF or hookflash) information
–
(0)
Appendix C Audio Mode Parameters and Defaults
OL-1267-01