Samsung Ubigate iBG3026 Configuration Manual page 426

CHAPTER 28. SIP Gateway Management
Step
5
6
Configuring Reliable Provisional Responses
This section describes how to enable the Reliable Provisional Response
feature. When SIP message is delivered via UDP, the reliability of 1xx
response cannot be guaranteed. That is, the originating side may nor receive
180 or 183 response sent from a destination side. In this case, the originating
side cannot hear the Ring back tone; and furthermore, if the early media path
is established to the response, the originating side cannot hear announcement.
To complement this, an additional method called PRACK is used to ensure
reliability of Provisional response. Ubigate iBG3026 supports this function by
default, or it can disable or forcibly provide the function.
Restrictions for Reliable Provisional Response
Reliable Provisional Response feature is available only when both originating
side and destination side support this function. If either side cannot support
this function, this function does not work. If either side has the setting to
support the function forcibly, and the other side does not support it, the call
between them fails.
How to Configure Reliable Provisional Response
You can enable or disable the Reliable Provisional Response Feature in the
following way.
Configuration Steps
configure terminal
−
voice service sip
−
rel1xx
−
exit
−
384
Command
exit
Example)
/configure/ voip-gateway/sip-ua# exit
exit
Example)
/configure/voip-gateway# exit
Purpose
Exits the current mode
Exits the current mode
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