CHAPTER68 Configuration Parameters Reference
Mediant 1000 Gateway & E-SBC | User's Manual
Parameter Description
rtcp-act-mode
[RTCPActivationMode]
Disables RTCP traffic when there is no RTP traffic.
This feature is useful, for example, to stop RTCP
traffic that is typically sent when calls are put on hold
(by an INVITE with 'a=inactive' in the SDP).
■ [0] Active Always = (Default) RTCP is active
even during inactive RTP periods, i.e., when the
media is in 'recvonly' or 'inactive' mode.
■ [1] Inactive Only If RTP Inactive = No RTCP is
sent when RTP is inactive.
Note: The parameter is applicable only to the
Gateway application.
'T.38 Fax Session'
configure voip > sip-
definition settings > t38-
sess-imm-strt
[T38FaxSessionImmediateStart]
Enables fax transmission of T.38 "no-signal" packets
to the terminating fax machine.
■ [0] Disable (default)
■ [1] Immediate Start on Fax = Device activates
T.38 fax relay upon receipt of a re-INVITE with
T.38 only in the SDP.
■ [2] Immediate Start on Fax & Voice = Device
activates T.38 fax relay upon receipt of a re-
INVITE with T.38 and audio media in the SDP.
The parameter is used for transmission from fax
machines connected to the device and located inside
a NAT. Generally, the firewall blocks T.38 (and other)
packets received from the WAN, unless the device
behind NAT sends at least one IP packet from the
LAN to the WAN through the firewall. If the firewall
blocks T.38 packets sent from the termination IP fax,
the fax fails.
To overcome this, the device sends No-Op (“no-
signal”) packets to open a pinhole in the NAT for the
answering fax machine. The originating fax does not
wait for an answer, but immediately starts sending
T.38 packets to the terminating fax machine.
Note: To enable No-Op packet transmission, use the
[NoOpEnable] and [NoOpInterval] parameters.
configure voip > sip-
definition settings > t38-
use-rtp-port
[T38UseRTPPort]
Defines the port (with relation to RTP port) for sending
and receiving T.38 packets.
■ [0] = (Default) Use the RTP port +2 to
send/receive T.38 packets.
■ [1] = Use the same port as the RTP port to
send/receive T.38 packets.
Note:
■ For the parameter to take effect, you must reset
the device.
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