AudioCodes Mediant 800B User Manual page 312

Parameter
Web: Play RB Tone to IP
CLI: play-rbt-to-ip
[IpProfile_PlayRBTone2IP]
Web: Early Media
CLI: early-media
[IpProfile_EnableEarlyMedia]
User's Manual

When enabled, the following conditions must also be met:

The Cisco gateway must include the following definition:
'modem passthrough nse payload-type 100 codec
g711alaw'.

Set the Modem transport type to Bypass mode
(VxxModemTransportType is set to 2) for all modems.

Set the NSEPayloadType parameter to 100.

The corresponding global parameter is NSEMode.
Enables the device to play a ringback tone to the IP side for IP-to-
Tel calls.

[0] Disable (Default)

[1] Enable = Plays a ringback tone after a SIP 183 session
progress response is sent.
Notes:

To enable the device to send a 183/180+SDP responses, set
the EnableEarlyMedia parameter to 1.

If the EnableDigitDelivery parameter is set to 1, the device
doesn't play a ringback tone to IP and doesn't send 183 or
180+SDP responses.

Digital interfaces: If this parameter is enabled and
EnableEarlyMedia is set to 1, the device plays a ringback tone
according to the following:

CAS: The device opens a voice channel, sends a 183+SDP
response, and then plays a ringback tone to IP.

ISDN: If a Progress or an Alerting message with PI (1 or 8)
is received from the ISDN, the device opens a voice
channel, sends a 183+SDP or 180+SDP response, but
doesn't play a ringback tone to IP. If PI (1 or 8) is received
from the ISDN, the device assumes that ringback tone is
played by the ISDN switch; otherwise, the device plays a
ringback tone to IP after receiving an Alerting message from
the ISDN. It sends a 180+SDP response, signaling to the
calling party to open a voice channel to hear the played
ringback tone.

The corresponding global parameter is PlayRBTone2IP.
Enables the Early Media feature for sending media (e.g., ringing)
before the call is established.

[0] Disable (default)

[1] Enable

Digital: The device sends a SIP 18x response with SDP,
allowing the media stream to be established before the call
is answered.

Analog: The device sends a SIP 183 Session Progress
response with SDP instead of a 180 Ringing, allowing the
media stream to be established before the call is answered.
Notes:

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.

CAS: See the ProgressIndicator2IP parameter.
312
Mediant 800B Gateway and E-SBC
Description
Document #: LTRT-10286