3Com VCX V7122/SIP VoIP Gateway User Manual
55
Figure 23
SIP Call Flow Example
INVITE F1
Trying F2
Ringing F3
200 OK F4
Ack
F5
BYE
F6
200 OK
F7
VCX V7122
10.8.201.10
VCX V7111 8FXS
10.8.201.108
F1 10.8.201.108 ==> 10.8.201.10 INVITE
INVITE sip:[email protected];user=phone SIP/2.0
Via: SIP/2.0/UDP 10.8.201.108;branch=z9hG4bKacsiJkDGd
From: <sip:[email protected]>;tag=1c5354
To: <sip:[email protected]>
Call-ID: [email protected]
CSeq: 18153 INVITE
Contact: <sip:[email protected];user=phone>
Supported: 100rel,em
Accept-Language: en
Allow: REGISTER,OPTIONS,INVITE,ACK,CANCEL,BYE,NOTIFY,PRACK,REFER,INFO
Content-Type: application/sdp
Content-Length: 208
v=0
o=3ComGW 18132 74003 IN IP4 10.8.201.108
s=Phone-Call
c=IN IP4 10.8.201.108
t=0 0
m=audio 4000 RTP/AVP 8 96
a=rtpmap:8 pcma/8000
a=rtpmap:96 telephone-event/8000
a=fmtp:96 0-15
a=ptime:20
F2 10.8.201.10 ==> 10.8.201.108 Trying
SIP/2.0 100 Trying
Via: SIP/2.0/UDP 10.8.201.108;branch=z9hG4bKacsiJkDGd
From: <sip:[email protected]>;tag=1c5354
To: <sip:[email protected]>
Call-ID: [email protected]
CSeq: 18153 INVITE
Content-Length: 0
Summary of Contents for VCX V7122 SIP
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