Version 7.2 1245 Mediant 1000B Gateway & E-SBC
User's Manual 65. Configuration Parameters Reference
Parameter Description
configure voip > sbc settings > sbc-forking-
handling-mode
[SBCForkingHandlingMode]
received due to call forking of an INVITE.
[0] Latch On First = (Default) Only the first 18x is
forwarded to the INVITE-initiating UA. If SIP 18x
with SDP is received, the device opens a voice
stream according to the received SDP and
disregards any subsequent 18x forking responses
(with or without SDP). If the first response is 180
without SDP, the device sends it to the other side.
[1] Sequential = All 18x responses are forwarded,
one at a time (sequentially) to the INVITE-initiating
UA. If a 18x arrives with an offer only, then only the
first offer is forwarded to the INVITE-initiating UA
and subsequent 18x responses are discarded.
Gateway Direct Route Prefix
configure voip > sbc settings > gw-direct-
route-prefix
[GWDirectRoutePrefix]
Defines the prefix destination Request-URI user part
that is appended to the original user part for
alternative IP-to-IP call routing from SBC to Gateway
(Tel) interfaces.
The valid value is a string of up to 16 characters. The
default is "acgateway-<original prefix destination
number>". For example, "acgateway-200".
For more information, see Configuring SBC IP-to-IP
Routing Rules on page 695.
configure voip > sbc settings > sbc-media-
sync
[EnableSBCMediaSync]
Enables synchronization of media between two SIP
user agents when a call is established between them.
Media synchronization means that the media is
properly negotiated (SDP offer/answer) between the
user agents. In some scenarios, the call is establish
despite the media not being synchronized. This may
occur, for example, in call transfer (SIP REFER)
where the media between the transfer target and
transferee are not synchronized. The device performs
media synchronization by sending a re-INVITE
immediately after the call is established in order for
the user agents to negotiate the media (SDP
offer/answer).
[0] Disable = (Default) Media synchronization is
performed only if the RTP mode (e.g., a=sendrecv,
a=sendrecv, a=sendonly, a=recvonly, and
a=inactive) between the user agents are different
and synchronization is required.
[1] Enable = Media synchronization is performed if
the media, including RTP mode or any other media
such as coders, is different and has not been
negotiated between the user agents.
[2] Never = Media synchronization is never
performed.
configure voip > sbc settings >
sbc-remove-sips-non-sec-transp
[SBCRemoveSIPSFromNonSecuredTranspo
rt]
Defines the SIP headers for which the device replaces
“sips:” with “sip:” in the outgoing SIP-initiating dialog
request (e.g., INVITE) when the destination transport
type is unsecured (e.g., UDP). (The “sips:” URI
scheme indicates secured transport, for example,
TLS.)
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