AudioCodes Mediant 2000 User Manual page 275

SIP User's Manual
Parameter
DTMF Parameters
Web: Declare RFC 2833 in
SDP
EMS: Rx DTMF Option
[RxDTMFOption]
Web/EMS: Tx DTMF Option
[TxDTMFOption]
Version 5.8
exists to send the call.

The IP Connectivity mechanism is enabled (using the parameter
AltRoutingTel2IPEnable) and there is no connectivity to any
destination IP address.
Notes:

The Busy Out behavior varies between different protocol types.

The Busy-Out condition can also be applied to a specific Trunk
Group. If there is no connectivity to the Serving IP Group of a
specific Trunk Group (defined in the 'Trunk Group Settings'
table), all the physical trunks pertaining to that Trunk Group are
set to the Busy-Out condition. Each trunk uses the proper Out-Of-
Service method according to the selected ISDN/CAS variant.

You can use the parameter DigitalOOSBehavior to select the
method for setting digital trunks to Out-Of-Service.
Defines the supported Receive DTMF negotiation method.

[0] No = Don't declare RFC 2833 telephony-event parameter in
SDP.

[3] Yes = Declare RFC 2833 telephony-event parameter in SDP
(default).
The device is designed to always be receptive to RFC 2833 DTMF
relay packets. Therefore, it is always correct to include the
'telephony-event' parameter as default in the SDP. However, some
devices use the absence of the 'telephony-event' in the SDP to
decide to send DTMF digits in-band using G.711 coder. If this is the
case, you can set RxDTMFOption to 0.
Determines a single or several preferred transmit DTMF negotiation
methods.

[0] Not Supported = No negotiation - DTMF digits are sent
according to the parameters DTMFTransportType and
RFC2833PayloadType (default).

[1] INFO (Nortel) = Sends DTMF digits according to IETF <draft-
choudhuri-sip-info-digit-00>.

[2] NOTIFY = Sends DTMF digits according to IETF <draft-mahy-
sipping-signaled-digits-01>.

[3] INFO (Cisco) = Sends DTMF digits according to Cisco format.

[4] RFC 2833.

[5] INFO (Korea) = Sends DTMF digits according to Korea
Telecom format.
Notes:

DTMF negotiation methods are prioritized according to the order
of their appearance.

When out-of-band DTMF transfer is used ([1], [2], [3], or [5]), the
parameter DTMFTransportType is automatically set to 0 (DTMF
digits are erased from the RTP stream).

When RFC 2833 (4) is selected, the device:
1) Negotiates RFC 2833 Payload Type (PT) using local and
remote SDPs.
275
6. Configuration Parameters Reference
Description
October 2009