AudioCodes Mediant 3000

User's Manual 402 Document #: LTRT-89730
Mediant 3000
Parameter Description
ISDN Progress Indicator (PI). The SDP is sent only if PI is set to
1 or 8 in the received Proceeding, Alerting, or Progress PRI
messages. See also the ProgressIndicator2IP parameter, which
if set to 1 or 8, the device behaves as if it received the ISDN
messages with the PI.

CAS: See the ProgressIndicator2IP parameter.

ISDN: Sending a 183 response depends on the ISDN PI. It
is sent only if PI is set to 1 or 8 in the received Proceeding
or Alerting PRI messages. Sending 183 response also
depends on the
ReleaseIP2ISDNCallOnProgressWithCause parameter,
which must be set to any value other than 2.
 See also the IgnoreAlertAfterEarlyMedia parameter. The
parameter allows, for example, to interwork Alert with PI to SIP
183 with SDP instead of 180 with SDP.
 You can also configure early SIP 183 response immediately
upon the receipt of an INVITE, using the EnableEarly183
parameter.
 The corresponding global parameter is EnableEarlyMedia.
Progress Indicator to IP
[IpProfile_ProgressIndicator2IP]
Defines the progress indicator (PI) sent to the IP.
 [-1] = (Default) Not configured:

Digital ISDN: The PI received in ISDN Proceeding,
Progress, and Alerting messages is used, as described in
the options below.
 [0] No PI =

Digital: For IP-to-Tel calls, the device sends 180 Ringing
response to the IP after receiving an ISDN Alerting or (for
CAS) after placing a call to the PBX/PSTN.
 [1] PI = 1:

Digital: For IP-to-Tel calls, if the parameter
EnableEarlyMedia is set to 1, the device sends 180 Ringing
with SDP in response to an ISDN Alerting or it sends a 183
Session 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.
 [8] PI = 8: same as PI = 1.
Note: The corresponding global parameter is ProgressIndicator2IP.
Early 183
[IpProfile_EnableEarly183]
Enables the device to send SIP 183 responses with SDP to the IP
upon receipt of INVITE messages. The parameter is applicable to
IP-to-Tel (ISDN) calls and applies to all calls.
 [0] Disable (default)
 [1] Enable = 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.
Notes:
 To enable this feature, set the EnableEarlyMedia parameter to
1.
 When the BChannelNegotiation parameter is set to Preferred or