AudioCodes E-SBC

CHAPTER19 Coders and Profiles
Mediant 1000 Gateway & E-SBC | User's Manual
Parameter Description
'Alternative DTMF Method'
sbc-alternative-dtmf-
method
[IpProfile_
SBCAlternativeDTMFMethod]
The device's first priority for DTMF method at each leg is
RFC 2833. Thus, if the device successfully negotiates
RFC 2833 for the SIP entity associated with the IP Profile,
the chosen DTMF method for this leg is RFC 2833. When
RFC 2833 negotiation fails, the device uses the DTMF
method configured by this parameter for the leg.
■ [0] As Is = (Default) The device does not attempt to
interwork any special DTMF method.
■ [1] In Band
■ [2] INFO - Cisco
■ [3] INFO - Nortel
■ [4] INFO - Lucent = INFO, Korea
Note: If the device interworks between different DTMF
methods and one of the methods is in-band DTMF packets
(in RTP), detection and generation of DTMF methods
requires DSP resources. However, RFC 2833 to SIP INFO
does not require DSP resources.
'Send Multiple DTMF Methods'
sbc-send-multiple-dtmf-
methods
[IPProfile_
SBCSupportMultipleDTMFMeth
ods]
Enables the device to send DTMF digits out-of-band (not
with audio stream) using both the SIP INFO and RFC 2833
methods for the same call on the leg to which this IP Profile
is associated. The RFC 2833 method sends out-of-band
DTMF digits using the RTP protocol while the SIP INFO
method sends the digits using the SIP protocol.
■ [0] Disable = (Default) The device sends DTMF digits
using only one method (either SIP INFO, RFC 2833, or
in-band).
■ [1] Enable = The device sends DTMF digits using both
methods - SIP INFO and RFC 2833.
If you have enabled the parameter, you can also configure
the device to stop sending DTMF digits using the SIP
INFO method if the device receives a SIP re-INVITE (or
UPDATE) from the SIP entity to where the SIP INFO is
being sent (and keep sending the DTMF digits using the
RFC 2833 method). This is done using the AudioCodes
proprietary SIP header X-AC-Action and a Message
Manipulation rule (inbound) to instruct the device to switch
to a different IP Profile that is configured to disable the
sending of DTMF digits using both methods (i.e., 'Send
Multiple DTMF Methods' is configured to Disable):
X-AC-Action: 'switch-profile;profile-
name=<IP Profile Name>'
If the IP Profile name contains one or more spaces, you
must enclose the name in double quotation marks, for
example:
X-AC-Action: 'switch-profile;profile-
name="My IP Profile"'
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