Technical Manual
U-SYS MRS6100 Media Resource Server
Chapter 5 MGCP and SIP
Huawei Technologies Proprietary
5-62
Via: SIP/2.0/UDP 182.20.62.2:5060
Content-Length: 0
II. Unsuccessful call flow
In an unsuccessful call flow shown in Figure 5-15, UA deletes the call in the process of
creating a session. It sends a CANCEL message that results in the call failure.
MRS6100AS
INVITE
100 Trying
180 Ringing
CANCEL
200 for CANCEL
487 for INVITE
ACK
SIP
terminal
SIP
INVITE
100 Trying
180 Ringing
CANCEL
200 for CANCEL
4XX for INVITE
ACK
MRS6100AS
INVITE
100 Trying
180 Ringing
CANCEL
200 for CANCEL
487 for INVITE
ACK
SIP
terminal
INVITE
100 Trying
180 Ringing
CANCEL
200 for CANCEL
4XX for INVITE
ACK
Figure 5-15 Unsuccessful call flow
Event 1: AS sends an INVITE request to MRS6100, containing SDP-1, the session
attribute of the remote caller SIP entity.
INVITE
sip:annc.BAU.pa%28an%3dfile%3a//welcome2%20it%3d2%20iv%3d20%29@182.2
0.60.1 SIP/2.0
From: <sip:1@182.20.62.2>;tag=5220000
To:sip:annc.BAU.pa%28an%3dfile%3a//welcome2%20it%3d2%20iv%3d20%29@18
2.20.60.1
Contact: sip:182.20.62.2
Call-ID: 2000@182.20.62.2
CSeq: 10 INVITE
Content-Length: 214
Content-Type: application/sdp
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