AudioCodes Mediant 600 - Page 596

SIP User's Manual 596 Document #: LTRT-83310
Mediant 600 & Mediant 1000
Parameter Description

The Supported and Required headers contain the '100rel' tag.
 The device sends PRACK messages if 180/183 responses are
received with '100rel' in the Supported or Required headers.
Web/EMS: Enable Early
Media
[EnableEarlyMedia]
Digital: Enables the device to send a 18x response with SDP instead
of a 18x, allowing the media stream to be established prior to the
answering of the call.
Analog: Enables the device to send a 183 Session Progress response
with SDP instead of a 180 Ringing, allowing the media stream to be
established prior to the answering of the call.
 [0] Disable = Early Media is disabled (default).
 [1] Enable = Enables Early Media.
Digital: The inclusion of the SDP in the 18x response depends on the
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.
Notes:
 See also the IgnoreAlertAfterEarlyMedia parameter. This
parameter allows, for example, to interwork Alert + PI to SIP 183 +
SDP instead of 180 + SDP.
 You can also configure early SIP 183 response immediately upon
receipt of an INVITE, using the EnableEarly183 parameter.
 Analog: To send a 183 response, you must also set the parameter
ProgressIndicator2IP to 1. If it is equal to 0, 180 Ringing response
is sent.
 This parameter can be configured per IP Profile, using the
IPProfile parameter (see 'Configuring IP Profiles' on page 219) and
per Tel profile, using the TelProfile parameter (see '
Configuring Tel
Profiles' on page 217).
Web/EMS: Enable Early 183
[EnableEarly183]
Enables the device to send SIP 183 responses with SDP to the IP
upon receipt of INVITE messages (for IP-to-Tel calls). The device
sends the RTP packets only once it receives an ISDN Progress,
Alerting with Progress indicator, or Connect message from the PSTN.
 [0] Disable (default)
 [1] Enable
For example, if enabled and the device receives an ISDN Progress
message, it starts sending RTP packets according to the initial
negotiation without sending the 183 response again. Therefore, this
feature reduces clipping of early media.
Notes:
 To enable this feature, configure the EnableEarlyMedia parameter
to 1.
 This feature is applicable only to ISDN interfaces.
[IgnoreAlertAfterEarlyMedi
a]
Determines the device's interworking of Alerting messages from PRI
to SIP.
 [0] = Disabled (default)
 [1] = Enabled
When enabled, if the device sends a 183 response with an SDP (due
to a received ISDN Progress or Proceeding with PI messages) and an
Alerting message is then received from the Tel side (with or without
Progress Indicator), the device does not send an additional 18x
response, and the voice channel remains open. However, if the