AudioCodes Mediant 500 E-SBC User Manual page 319

User's Manual
Parameter
Web: RFC 2833 Behavior
CLI: sbc-rfc2833-behavior
[IpProfile_SBCRFC2833Behavior]
Web: Alternative DTMF Method
CLI: sbc-alternative-dtmf-method
[IpProfile_SBCAlternativeDTMFMetho
d]
Version 6.8

[3] Both = Each offer\answer is extended (if not already)
to two media lines - one RTP and the other SRTP.
If two SBC legs (after offer\answer negotiation) use different
security types (i.e., one RTP and the other SRTP), the
device performs RTP-SRTP transcoding. To transcode
between RTP and SRTP, the following prerequisites must be
met:

At least one supported SDP "crypto" attribute and
parameters.

EnableMediaSecurity must be set to 1.
If one of the above transcoding prerequisites is not met,
then:

any value other than "As is" is discarded.

if the incoming offer is SRTP, force transcoding, coder
transcoding, and DTMF extensions are not applied.
Defines the handling of RFC 2833 SDP offer\answer
negotiation for this SIP entity.

[0] As is = (Default) The device does not intervene in the
RFC 2833 negotiation.

[1] Extend = Each outgoing offer\answer includes RFC
2833 in the offered SDP (the device adds RFC 2833 only
if the incoming offer does not include RFC 2833).

[2] Disallow = The device removes RFC 2833 from the
incoming offer.
Note: If the device interworks between different DTMF
methods and one of the methods is in-band DTMF packets
(RFC 2833), detection and generation of DTMF methods
requires DSP resources.
The device's first priority for DTMF method at each leg is
RFC 2833. Thus, if the device successfully negotiates RFC
2833 for this SIP entity, the chosen DTMF method for this
leg is RFC 2833. When RFC 2833 negotiation fails, the
device uses this parameter to define the DTMF method 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
(RFC 2833), detection and generation of DTMF methods
requires DSP resources.
319
19. Coders and Profiles
Description
Mediant 500 E-SBC