User's Manual 992 Document #: LTRT-10466
Mediant 500L MSBR
Parameter Description
18x response is the response with a different SIP to-tag than
the previous 18x response. These responses are typically
generated (initiated) by Proxy / Application servers that
perform call forking, sending the device's originating INVITE
(received from SIP clients) to several destinations, using the
same Call ID.
[0] Parallel handling = (Default) If SIP 18x with SDP is
received, the device opens a voice stream according to
the received SDP and disregards any subsequently
received 18x forking responses (with or without SDP). If
the first response is 180 without SDP, the device
responds according to the PlayRBTone2TEL parameter
and disregards the subsequent forking 18x responses.
[1] Sequential handling = If 18x with SDP is received, the
device opens a voice stream according to the received
SDP. The device re-opens the stream according to
subsequently received 18x responses with SDP, or plays
a ringback tone if 180 response without SDP is received.
If the first received response is 180 without SDP, the
device responds according to the PlayRBTone2TEL
parameter and processes the subsequent 18x forking
responses.
Note: Regardless of this parameter setting, once a SIP 200
OK response is received, the device uses the RTP
information and re-opens the voice stream, if necessary.
Web: Forking Timeout
CLI: forking-timeout
[ForkingTimeOut]
Defines the timeout (in seconds) that is started after the first
SIP 2xx response has been received for a User Agent when
a Proxy server performs call forking (Proxy server forwards
the INVITE to multiple SIP User Agents). The device sends
a SIP ACK and BYE in response to any additional SIP 2xx
received from the Proxy within this timeout. Once this
timeout elapses, the device ignores any subsequent SIP
2xx.
The number of supported forking calls per channel is 20. In
other words, for an INVITE message, the device can receive
up to 20 forking responses from the Proxy server.
The valid range is 0 to 30. The default is 30.
Web: Tel2IP Call Forking Mode
CLI: tel2ip-call-forking-mode
[Tel2IPCallForkingMode]
Enables Tel-to-IP call forking, whereby a Tel call can be
routed to multiple IP destinations.
[0] Disable (default)
[1] Enable
Note:
Once enabled, routing rules must be assigned Forking
Groups in the Outbound IP Routing table.
CLI: configure voip/sip-definition
advanced-settings/forking-delay-time-
invite
[ForkingDelayTimeForInvite]
Defines the interval (in seconds) to wait before sending
INVITE messages to the other members of the forking
group. The INVITE is immediately sent to the first member.
The valid value range is 0 to 40. The default is 0 (i.e., sends
immediately).
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