AudioCodes Mediant 800B MSBR User Manual page 328

Parameter
Web: QSIG Tunneling
CLI: enable-qsig-tunneling
[IpProfile_EnableQSIGTunneling]
Web: Early 183
CLI: enable-early-183
[IpProfile_EnableEarly183]
Mediant 800B MSBR
Description

This feature is similar to that of the
EnableISDNTunnelingIP2Tel parameter. If both
parameters are configured, the
EnableISDNTunnelingIP2Tel parameter takes
precedence.

The corresponding global parameter is AddIEinSetup.
Enables QSIG tunneling-over-SIP for this SIP entity. This
is according to IETF Internet-Draft draft-elwell-sipping-
qsig-tunnel-03 and ECMA-355 and ETSI TS 102 345.

[0] Disable (default).

[1] Enable = Enables QSIG tunneling from QSIG to
SIP, and vice versa. All QSIG messages are sent as
raw data in corresponding SIP messages using a
dedicated message body.
Notes:

QSIG tunneling must be enabled on originating and
terminating devices.

To enable this function, set the
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 358.

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
Preferred or Any, the EnableEarly183 parameter is
ignored and a SIP 183 is not sent upon receipt of an
328
Mediant 800B MSBR
Document #: LTRT-12813