CHAPTER 3. SIP Gateway Management
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© SAMSUNG Electronics Co., Ltd.
Table 3.1 Call Setup and Disconnect
No.
Message
Description
1
Setup
SIP Gateway 1 receives Setup from PBX A. Setup
indicates the call attempt from User A to User B.
2
INVITE
SIP Gateway 1 sends INVITE request to SIP Gateway2.
INVITE request indicates the call attempt from User A to
User B. INVITE includes the media capability of SIP
Gateway1.
3
Call Proceeding
SIP Gateway 1 sends Call Proceeding to PBX A. Call
Proceeding indicates that SIP Gateway1 received Setup
and attempts SIP signaling call.
4
Setup
SIP Gateway 2, upon receiving INVITE, sends Setup to
PBX B.
5
100 Trying
SIP Gateway 2 sends a response to INVITE request to
SIP Gateway1. 100 Trying response indicates that SIP
Gateway 2 has received the INVITE request.
6
Call Proceeding
SIP Gateway 2 receives Call Proceeding from PBX B.
Call Proceeding indicates that PBX B, after receiving
Setup, proceeds with a call.
7
Alerting
SIP Gateway 2 receives Alerting from PBX B. Alerting
indicates that User B is ringing.
8
180 Ringing
SIP Gateway 2 sends 180 Ringing to SIP Gateway 1. 180
Ringing indicates that a callee is located at SIP Gateway
2, and the User B is currently alerted.
9
Alerting
Upon receiving 180 Ringing, SIP Gateway 1 sends
Alerting to PBX A.
10
Connect
If a called subscriber replies, SIP Gateway 2 receives
Connect from PBX B. Connect indicates that a call was
received from User B.
11
200 OK
SIP Gateway 2 sends 200 OK to SIP Gateway 1. 200 OK
indicates that a session was formed normally between
SIP Gateway2 and SIP Gateway1. 200 OK includes the
media capability of SIP Gateway2.
12
Connect
Upon receiving 200 OK, SIP Gateway1 sends Connect to
PBX A.
13
Connect ACK
SIP Gateway 1 receives Connect ACK from PBX A. Connect
ACK indicates that Connect was received normally.
14
ACK
SIP Gateway 2 sends ACK request to SIP Gateway2.
ACK request indicates that SIP Gateway 1 received 200
OK response normally.
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