CHAPTER72 Configuration Parameters Reference
Mediant 800 Gateway & E-SBC | User's Manual
Parameter Description
'Play Ringback Tone to Tel'
configure voip > sip-
definition settings >
play-rbt2tel
[PlayRBTone2Tel]
Determines the playing method of the ringback tone to
the Tel side. Digital interfaces: The parameter applies
to all trunks that are not configured by the
PlayRBTone2Trunk parameter (which defines ringback
tone per Trunk).
■ [0] Don't Play =
✔ Analog Interfaces: Ringback tone is not played.
✔ Digital Interfaces: The device doesn't play a
ringback tone. No PI is sent to the PSTN
unless the [ProgressIndicator2ISDN_x]
parameter is configured differently.
■ [1] Play on Local =
✔ Analog interfaces: Plays a ringback tone to the
Tel side of the call when a SIP 180/183
response is received.
✔ Digital interfaces:
CAS: The device plays a local ringback tone to
the PSTN upon receipt of a SIP 180 Ringing
response (with or without SDP). Note that the
receipt of a 183 response does not cause the
device to play a ringback tone (unless the
SIP183Behaviour parameter is set to 1).
ISDN: The device operates according to the
LocalISDNRBSource parameter:
1) If the device receives a 180 Ringing
response (with or without SDP) and the
LocalISDNRBSource parameter is set to 1, it
plays a ringback tone and sends an ISDN Alert
with PI = 8 (unless the
[ProgressIndicator2ISDN_x] parameter is
configured differently).
2) If the LocalISDNRBSource parameter is set
to 0, the device doesn't play a ringback tone
and an Alert message without PI is sent to the
ISDN. In this case, the PBX / PSTN plays the
ringback tone to the originating terminal. Note
that the receipt of a 183 response does not
cause the device configured for ISDN to play a
ringback tone; the device issues a Progress
message (unless SIP183Behaviour is set to 1).
If the SIP183Behaviour parameter is set to 1,
the 183 response is handled the same way as a
180 Ringing response.
■ [2] Prefer IP = (Default):
✔ Analog interfaces: Plays a ringback tone to the
Tel side only if a 180/183 response without
SDP is received. If 180/183 with SDP message
is received, the device cuts through the voice
channel and doesn't play the ringback tone.
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