AudioCodes Mediant 500 E-SBC User Manual page 317

User's Manual
Parameter
Web: Early 183
CLI: enable-early-183
[IpProfile_EnableEarly183]
Web: Early Answer Timeout
CLI: early-answer-timeout
[IpProfile_EarlyAnswerTimeout]
SBC
Allowed Media Types
CLI: sbc-allowed-media-types
[IPProfile_SBCAllowedMediaTypes]
Version 6.8
ISDNDuplicateQ931BuffMode parameter to 128 (i.e.,
duplicate all messages).

To define the format of encapsulated QSIG messages,
use the QSIGTunnelingMode parameter.

Tunneling according to ECMA-355 is applicable to all
ISDN variants (in addition to the QSIG protocol).

For more information on QSIG tunneling, see QSIG
Tunneling on page 344.

The corresponding global parameter is
EnableQSIGTunneling.
Enables the device to send SIP 183 responses with SDP to
the IP upon receipt of INVITE messages. This parameter is
applicable to IP-to-Tel (ISDN) and IP-to-IP calls, and applies
to all calls.

[0] Disable (default)

[1] Enable =

IP-to-Tel calls: By sending the 183 response, the
device opens an RTP channel before receiving the
"progress" tone from the ISDN side. The device
sends RTP packets immediately upon receipt of an
ISDN Progress, Alerting with Progress indicator, or
Connect message according to the initial negotiation
without sending the 183 response again, thereby
saving response time and avoiding early media
clipping.

IP-to-IP calls: Sending the 183 response enables SIP
servers that require a stream of early media, to keep
sessions open.
Notes:

To enable this feature, set the EnableEarlyMedia
parameter to 1.

When the BChannelNegotiation parameter is set to a
non-Exclusive value (Preferred or Any), the
EnableEarly183 parameter is ignored and a SIP 183 is
not sent upon receipt of an INVITE. In such a case, you
can set the ProgressIndicator2IP parameter to 1 (PI = 1)
for the device to send a SIP 183 upon receipt of an ISDN
Call Proceeding message.

The corresponding global parameter is EnableEarly183.
Defines the duration (in seconds) that the device waits for an
ISDN Connect message from the called party (Tel side),
started from when it sends a Setup message. If this timer
expires, the call is answered by sending a SIP 200 OK
message (to the IP side).
The valid range is 0 to 2400. The default is 0 (i.e., disabled).
Note: The corresponding global parameter is
EarlyAnswerTimeout.
Defines media types permitted for this SIP entity. The media
type appears in the SDP 'm=' line (e.g., 'm=audio'). The
device permits only media types that appear in both the SDP
offer and this configured list. If no common media types exist
317
19. Coders and Profiles
Description
Mediant 500 E-SBC