CHAPTER 3. SIP Gateway Management
352
© SAMSUNG Electronics Co., Ltd.
Table 3.3 Call via Proxy Server
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 a Proxy server.
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
INVITE
Proxy Server searches a proper SIP gateway and
delivers INVITE request.
5
100 Trying
Proxy Server sends 100 Trying to SIP Gateway 1. 100
Trying indicates that a proxy server is processing INVITE
request.
6
Setup
Upon receiving INVITE from a proxy server, Gateway 2
sends Setup to PBX B.
7
100 Trying
Upon receiving INVITE from a proxy server, SIP Gateway
2 replies with 100 Trying.
8
Call Proceeding
SIP Gateway 2 receives Call Proceeding from PBX B.
9
Alerting
SIP Gateway 2 receives Alerting from PBX B.
10
180 Ringing
Upon receiving Ringing, SIP Gateway 2 sends 180
Ringing to a proxy server. 180 Ringing indicates that a
callee is located at SIP Gateway 2, and the User B is
currently alerted.
11
180 Ringing
Proxy Server transfers 180 Ringing to SIP Gateway 1.
12
Alerting
Upon receiving 180 Ringing, Gateway 1 sends Alerting to
PBX A.
13
Connect
When a called party replies, SIP Gateway2 receives
Release Connect from PBX B.
14
200 OK
SIP Gateway 2 sends 200 OK to Proxy Server. 200 OK
indicates the response of a called party. 200 OK includes
the media capability of SIP Gateway2.
15
200 OK
Proxy Server 2 sends 200 OK to SIP Gateway 1.
16
Connect
Upon receiving 200 OK, SIP Gateway1 sends Connect to
PBX A.
17
Connect ACK
SIP Gateway 1 receives Connect ACK from PBX A.
Summary of Contents for Ubigate iBG2016
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