Version 7.2 399 Mediant 1000B Gateway & E-SBC
User's Manual 19. Coders and Profiles
Parameter Description
Remote Multiple Early Dialogs
sbc-multi-early-diag
[IpProfile_SBCRemoteMultiple
EarlyDialogs]
Defines the device's handling of To-header tags in call forking
responses (i.e., multiple SDP answers) sent to the SIP entity
associated with the IP Profile. When the SIP entity initiates an
INVITE that is subsequently forked (for example, by a proxy server)
to multiple endpoints, the endpoints respond with a SIP 183
containing an SDP answer. Typically, each endpoint's response has
a different To-header tag. For example, a call initiated by the SIP
entity (100@A) is forked and two endpoints respond with ringing,
each with a different tag:
Endpoint "tag 2":
SIP/2.0 180 Ringing
From: <sip:100@A>;tag=tag1
To: sip:200@B;tag=tag2
Call-ID: c2
Endpoint "tag 3":
SIP/2.0 180 Ringing
From: <sip:100@A>;tag=tag1
To: sip:200@B;tag=tag3
Call-ID: c2
In non-standard behavior (when the parameter is configured to
Disable), the device forwards all the SDP answers with the sam
In the example, endpoint "tag 3" is sent with the same tag as
endpoint "tag 2" (i.e., To: sip:200@B;tag=tag2).
[-1] According to Operation Mode = (Default) Depends on the
setting of the 'Operation Mode' parameter in the IP Group or
SRDs table:
B2BUA: Device operates as if the parameter is set to Disable
[0].
Call State-full Proxy: Device operates as if the parameter is
set to Enable [1]. In addition, the device preserves the From
tags and Call-IDs of the endpoints in the SDP answer sent to
the SIP entity.
[0] Disable = Device sends the multiple SDP answers with the
same To-header tag, to the SIP entity. In other words, this option
is relevant if the SIP entity does not support multiple dialogs (and
multiple tags). However, non-standard, multiple answer support
may still be configured by the SBCRemoteMultipleAnswersMode
parameter.
[1] Enable = Device sends the multiple SDP answers with
different To-header tags, to the SIP entity. In other words, the SIP
entity supports standard multiple SDP answers (with different To-
header tags). In this case, the SBCRemoteMultipleAnswersMode
parameter is ignored.
Note: If the parameter and the SBCRemoteMultipleAnswersMode
parameter are disabled, multiple SDP answers are not reflected to
the SIP entity (i.e., the device sends the same SDP answer in
multiple 18x and 200 responses).
Remote Multiple Answers
Mode
sbc-multi-answers
[IpProfile_SBCRemoteMultiple
AnswersMode]
Enables interworking multiple SDP answers within the same SIP
dialog (non-standard). The parameter enables the device to forward
multiple answers to the SIP entity associated with the IP Profile. The
parameter is applicable only when the
IpProfile_SBCRemoteMultipleEarlyDialogs parameter is disabled.
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