4.20.19. PrmDTMFXferMode (DTMF Transmission Mode)

Parameter Number: 0x1b06

Description: The PrmDTMFXferMode parameter allows you to select the method for transmitting the DTMF signals. Dual Tone Multi-frequency (DTMF) signals can be transmitted over the IP network either in-band as a standard voice packet or over the H.245 channel as a special out-of-band DTMF packet.

Note: If out-of-band DTMF transmission is selected, the application may not use User Input Indication.

Values:

• 0 = No DTMF signals are transmitted
• 1 = DTMF signals are transmitted in-band
• 2 = DTMF signals are transmitted out-of-band
• 3 = Reserved

The following table describes each of the DTMF options:

DTMF Comes from...	DTMF goes to...
	Out Of Band DTMF Enabled	Out Of Band DTMF Disabled
DTMF RTP voice from Internet	to local PSTN	to local PSTN
H.245 UII command from Internet	to local PSTN	UII command to local host application
DTMF voice from local PSTN	H245 UII command to Internet	DTMF RTP voice to Internet
UII command from local host application	Ignored (not passed to remote site)	H245 UII command to Internet

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