AudioCodes Mediant 8000, Installation, Operation & Maintenance Manual

Page: 591 / 924

Version 6.6 591 October 2014
Installation & Operation Manual 40. General SIP Configuration
Parameter
Name
Type
Provisioning
Type
Description
Play Ringback
Tone to IP Enum
Disable, Enable Instant Defines whether or not the ringback tone
(RBT) is played to the IP side for IP-to-Tel
calls.
If configured to Enable and early media is
enabled, the gateway plays a ringback tone
according to the following:

For CAS interfaces: the gateway opens a
voice channel, sends a 183+SDP
response, and then plays a ringback tone
to IP.

For ISDN interfaces: if a Progress or an
Alerting message with PI (1 or 8) is
received from the ISDN, the gateway
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
gateway assumes that ringback tone is
played by the ISDN switch. Otherwise,
the gateway 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.
Notes:
To enable the gateway to send a
183/180+SDP responses, set Enable Early
Media to Enable.
If Enable Digit Delivery is Enabled, the
gateway doesn't play a ringback tone to IP
and doesn't send 183 or 180+SDP
responses.