AudioCodes Mediant 4000 SBC User Manual page 784

Parameter
ecan-frmt
[SDPEcanFormat]
First Call Ringback Tone
ID
configure voip > sip-
definition settings > 1st-
call-rbt-id
[FirstCallRBTId]
Media IP Version
Preference
media-ip-ver-pref
[MediaIPVersionPreferen
ce]
WebSocket Keep-Alive
Period
configure voip > sip-
definition settings >
websocket-keepalive
[WebSocketProtocolKeep
AlivePeriod]
Retransmission Parameters
SIP T1 Retransmission
Timer
configure voip > sip-
definition settings > t1-re-
tx-time
[SipT1Rtx]
User's Manual

[0] = (Default) The 'ecan' attribute appears on the 'a=gpmd' line.

[1] = The 'ecan' attribute appears as a separate attribute.

[2] = The 'ecan' attribute is not included in the SDP.

[3] = The 'ecan' attribute and the 'vbd' parameter are not included in the
SDP.
Note: The parameter is applicable only when the IsFaxUsed parameter is
set to 2, and for re-INVITE messages generated by the device as result of
modem or fax tone detection.
Defines the index of the first ringback tone in the CPT file. This option
enables an Application server to request the device to play a distinctive
ringback tone to the calling party according to the destination of the call.
The tone is played according to the Alert-Info header received in the 180
Ringing SIP response (the value of the Alert-Info header is added to the
value of the parameter).
The valid range is -1 to 1,000. The default is -1 (i.e., play standard
ringback tone).
Note:

It is assumed that all ringback tones are defined in sequence in the
CPT file.

In case of an MLPP call, the device uses the value of the parameter
plus 1 as the index of the ringback tone in the CPT file (e.g., if this
value is set to 1, then the index is 2, i.e., 1 + 1).
Global parameter that defines the preferred RTP media IP addressing
version (IPv4 or IPv6) for outgoing SIP calls. You can also configure this
functionality per specific calls, using IP Profiles
(IpProfile_MediaIPVersionPreference). For a detailed description of the
parameter and for configuring this functionality in the IP Profiles table, see
Configuring IP Profiles on page 384.
Defines how often (in seconds) the device sends ping messages (keep
alive) to check whether the WebSocket session with the Web client is still
connected.
The valid value is 5 to 2000000. The default is 0 (i.e., ping messages are
not sent).
For more information on WebSocket, see SIP over WebSocket on page
516.
Note: The device always replies to WebSocket ping control messages with
pong messages.
Defines the time interval (in msec) between the first transmission of a SIP
message and the first retransmission of the same message.
The default is 500.
Note: The time interval between subsequent retransmissions of the same
SIP message starts with SipT1Rtx. For INVITE requests, it is multiplied by
two for each new retransmitted message. For all other SIP messages, it is
multiplied by two until SipT2Rtx. For example, assuming SipT1Rtx = 500
and SipT2Rtx = 4000:

The first retransmission is sent after 500 msec.

The second retransmission is sent after 1000 (2*500) msec.
784
Description
Document #: LTRT-41729
Mediant 4000 SBC