S E S S I O N I N I T I A T I O N P R O T O C O L ( S I P ) C O N F I G U R A T I O N
V I A W E B
Rev H
148 of 244
Support PRACK method with
provisional response reliability
Provides a standard reliability mechanism for
provisional responses, which means that the Gateway
is sending ACKs for provisional responses (180, 183,
etc).
Reference: RFC3262 Reliability of Provisional
Responses in the Session Initiation Protocol (SIP)
Encode SIP URI with user
parameter
The set of valid telephone-subscriber strings is a
subset of valid user strings. The user URI parameter
exists to distinguish telephone numbers from user
names that happen to look like telephone numbers. If
the user string contains a telephone number formatted
as a telephone-subscriber, the user parameter value
“phone” SHOULD be present. Even without this
parameter, recipients of SIP and SIPS URIs MAY
interpret the pre-@ part as a telephone number if local
restrictions on the name space for user name allow it.
Reference: RFC3261, Section 19.1.1:
SIP and SIPS
URI Components
Example: from: <77540@192.168.0.40;user=phone>
INVITE Expires Timer value (sec)
Defines the length of time we allow for an OK
response to an INVITE. If the time elapses, we
transmit a CANCEL to invalidate the INVITE.
There is no default value - this option is not used if no
value is specified.
Reference: RFC3261, Section 13.2.1 Creating the
Initial INVITE
“The User Agent Client (UAC) MAY add an Expires
header field (Section 20.19) to limit the validity of the
invitation. If the time indicated in the Expires header
field is reached and no final answer for the INVITE has
been received, the UAC core SHOULD generate a
CANCEL request for the INVITE, as per Section 9”.
SIP Session Timer value (sec)
Specifies the Session-Expires header in an INVITE
request. Used as the SIP session’s keep-alive
mechanism.
There is no default value - this option is not used if no
value is specified.
Draft-ietf-sip-session-timer-10.txt of the Internet
Engineering Task Force is currently supported:
“This document defines an extension to the Session
Initiation Protocol (SIP). This extension allows for a
periodic refresh of SIP sessions through a re-INVITE
or UPDATE request. The refresh allows both user
agents and proxies to determine if the SIP session is
still active”.
The extension defines two new header fields, Session-
Expires, which conveys the lifetime of the session, and
Min-SE, which conveys the minimum allowed value for
the session timer.
SIP Registration Timer Value (sec)
Specifies a suggested value that the server should
take into consideration when it returns the Expires
timer for registration in the OK response. The value is
inserted in the Expires header. The server may choose
another value, and the device will obey that value (re-
Summary of Contents for AC - 232 - TX
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