AudioCodes Mediant 4000 SBC User Manual page 894

Parameter
configure voip > sbc settings > sbc-xfer-
prefix
[SBCXferPrefix]
configure voip > sbc settings > sbc-3xx-bhvt
[SBC3xxBehavior]
configure voip > sbc settings >
enforce-media-order
[SBCEnforceMediaOrder]
User's Manual
Description
functionality in the IP Profiles table, see ''Configuring
IP Profiles'' on page 418.
Note: If this functionality is configured for a specific IP
Profile, the settings of this global parameter is ignored
for calls associated with the IP Profile.
When the SBCReferBehavior is set to 1, the device,
while interworking the SIP REFER message, adds the
prefix "T~&R-" to the user part of the URI in the Refer-
To header. After this, the device can receive an
INVITE with such a prefix (the INVITE is sent by the
UA that receives the REFER message or 302
response). If the device receives an INVITE with such
a prefix, it replaces the prefix with the value defined
for the SBCXferPrefix parameter.
By default, no value is defined.
Note: This feature is also applicable to 3xx redirect
responses. The device adds the prefix "T~&R-" to the
URI user part in the Contact header if the
SBC3xxBehavior parameter is set to 1.
Global parameter that defines the handling of SIP 3xx
redirect responses. You can also configure this
functionality per specific calls, using IP Profiles
(IpProfile_SBCRemote3xxBehavior). For a detailed
description of the parameter and for configuring this
functionality in the IP Profiles table, see ''Configuring
IP Profiles'' on page 418.
Note: If this functionality is configured for a specific IP
Profile, the settings of this global parameter is ignored
for calls associated with the IP Profile.
Enables the device to include all previously negotiated
media lines within the current session ('m=' line) in the
SDP offer-answer exchange (RFC 3264).

[0] Disable (default)

[1] Enable
For example, assume a call (audio) has been
established between two endpoints and one endpoint
wants to subsequently send an image in the same call
session. If the parameter is enabled, the endpoint
includes the previously negotiated media type (i.e.,
audio) with the new negotiated media type (i.e.,
image) in its SDP offer:
v=0
o=bob 2890844730 2890844731 IN IP4
host.example.com
s=
c=IN IP4 host.example.com
t=0 0
m=audio 0 RTP/AVP 0
m=image 12345 udptl t38
If the parameter is disabled, the only 'm=' line
included in the SDP is the newly negotiated media
(i.e., image).
894
Mediant 4000 SBC
Document #: LTRT-40203