Sip Request Methods Supported In Screenos Devices - Juniper NETWORK AND SECURITY MANAGER 2010.4 - CONFIGURING SCREENOS DEVICES GUIDE REV 01 Manual

Configuring ScreenOS Devices Guide
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SIP Request Methods Supported in ScreenOS Devices

282
Agent (UA) is an application that runs at the endpoints of the call and consists of two
parts: the User Agent Client (UAC), which sends SIP requests on behalf of the user; and
a User Agent Server (UAS), which listens to the responses and notifies the user when
they arrive. Examples of UAs are SIP proxy servers and phones.
SCCP Support in ScreenOS Devices Overview on page 279
ALG Overview on page 286
SIP Request Methods Supported in ScreenOS Devices on page 282
Types of SIP Response Classes Supported in ScreenOS Devices on page 284
The SIP transaction model includes a number of request and response messages, each
of which contains a method field that denotes the purpose of the message. The method
types and response codes supported by ScreenOS are listed in Table 70 on page 282.
Table 70: SIP Request Methods
Method
Types/Response
Codes Description
INVITE A user sends an INVITE request to
invite another user to participate in a
session. The body of an INVITE
request may contain the description
of the session.
ACK The user from whom the INVITE
originated sends an ACK request to
confirm reception of the final
response to the INVITE request. If the
original INVITE request did not
contain the session description, the
ACK request must include it.
OPTIONS A User Agent (UA) uses OPTIONS to
obtain information about the
capabilities of the SIP proxy. A server
responds with information about
what methods, session description
protocols, and message encoding it
supports. In NAT mode, when the
OPTIONS request is sent from a UA
outside NAT to a proxy inside NAT,
the SIP ALG translates the address
in the Request-URI and the IP
address in the To field to the
appropriate IP address of the internal
client. When the UA is inside NAT and
the proxy is outside NAT, the SIP ALG
translates the From, Via, and Call-ID
fields.
Modified Fields
In NAT mode, the IP addresses in
the Via, From, To, Call-ID, Contact,
Route, and Record-Route header
fields are modified.
In NAT mode, the IP addresses in
the Via, From, To, Call-ID, Contact,
Route, and Record-Route header
fields are modified.
NA
Copyright © 2010, Juniper Networks, Inc.