29 Appendix
ARGUS 152
389
I) VoIP SIP status codes
SIP requests:
The six basic requests / methods:
INVITE
Invite a user to a session (call - initiates a session)
ACK
Acknowledge an INVITE request
BYE
Terminate a session (hangup)
CANCEL
Terminates the setup of a connection
REGISTER
Provides data regarding subscriber availability (host name and IP address)
OPTIONS
Supplies information regarding the functions supported by the other SIP
telephone
SIP responses:
SIP responses are answers to SIP requests. There are six basic types of SIP responses
with numerous sub-responses:
1xx
Informational responses (180 indicates for example that the phone of the
party called is ringing)
2xx
Reports that the request has been successful
3xx
Redirection responses
4xx
Client failure responses
5xx
Server failure responses
6xx
Global failure responses
Display
on
ARGUS:
Code No.
Meaning
Explanation
100
Trying
The ARGUS is attempting to setup a call.
180
Ringing
The phone at the other end is ringing.
181
Call Being Forwarded
The call is being forwarded.
182
Call Queued
The call is in a wait loop.
183
Session Progress
The call is being setup.
200
OK
Everything is all right.
202
Accepted
Connection has been accepted.