Version 6.6 699 October 2014
Installation & Operation Manual 41. PSTN Gateway and IP-to-IP Applications
Parameter
Name
Type Provisioning
Type
Description
Enable Early
Media
Enum
Disable, Enable
Instant If enabled, the gateway sends
183 Session Progress response
with SDP (instead of 180
Ringing), allowing the media
stream to be set up prior to the
answering of the call.
Note: Sending 183 response
depends on the Progress
Indicator. It is sent only if PI=1
or PI=8 was received in
Proceeding or Alert PRI
messages. For CAS gateways
see the ProgressIndicator2IP
parameter.
Progress
Indicator to
IP
Enum
NotConfigured, NoPI, PI=1, PI=8
Instant
NotConfigured - for ISDN
spans, the progress indicator
(PI) that is received in ISDN
Proceeding, Progress and
Alert messages is used as
described in the options
below.
NoPI - For IP-Tel call, the
gateway sends '180 Ringing'
SIP response to IP after
receiving ISDN Alert or (for
CAS) after placing a call to
PBX/PSTN.
PI=1, PI=8 - For IP-Tel call, if
'EnableEarlyMedia=1', the
gateway sends ‘180 Ringing’
with SDP in response to an
ISDN alert, or it sends a '183
session in progress'
message with SDP in
response to only the first
received ISDN Proceeding or
Progress message, after a
call is placed to PBX/PSTN
over the trunk.
Echo
Canceller
Enum
Disable, Enable
Instant Enables/disables echo canceller
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