Dialogic IP Phone 05-2239-009 User Manual

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Dialogic Corporation

Table 47 shows the parameter IDs in the IPSET_DTMF parameter set. This parameter set is used to 
set DTMF-related parameters for the notification, suppression or sending of DTMF digits. 

This parameter set is not supported in SIP third party call control (3PCC) operating mode.

IPPARM_
DTMF_ALPHANUMERIC

Type: IP_DTMF_DIGITS

Size: sizeof(
IP_DTMF_DIGITS)

Used when sending or receiving DTMF via 
UII alphanumeric messages using the 
Global Call extension API. The parameter 
value contains an IP_DTMF_DIGITS 
structure that includes the digit string. 

H.323, 
SIP 
1PCC

IPPARM_
DTMF_RFC2833_
PAYLOAD_TYPE

Type: unsigned char

Size: sizeof(char)

Used to specify the RFC2833 RTP payload 
type. Valid values are in the range from 96 
to 127. The default value is 
IP_USE_STANDARD_PAYLOADTYPE 
(101). 

H.323, 
SIP 
1PCC

IPPARM_
SUPPORT_DTMF_
BITMASK

Type: int

Size: sizeof(int)

Used to specify a bitmask that defines 
which DTMF transmission methods are to 
be supported. 

Possible values are: 

• IP_DTMF_TYPE_ALPHANUMERIC †

• IP_DTMF_TYPE_INBAND_RTP ‡

• IP_DTMF_TYPE_RFC_2833

H.323, 
SIP 
1PCC

† The IP_DTMF_TYPE_ALPHANUMERIC value, which is the default, is only valid when using H.323.

‡ The inband mode cannot be used reliably with low bit-rate coders.