Sip Call Flow Example - 3Com VCX V7122 User Manual

PSTNPrefix = 1,1
PSTNPrefix = 2,2
PSTNPrefix = 3,4
PSTNPrefix = 4,4
In gateway "B", remove the first digit from each IP PSTN number, before it is used in an
outgoing call:
NumberMapIP2Tel = *,1

SIP Call Flow Example

The Call Flow, shown in
V7122 gateway and an VCX V7111 gateway during a simple call.
VCX V7111 with phone number "8000", calls VCX V7122 with phone number "1000":
Figure 60 SIP Call Flow Example
Mediant 2000
10.8.201.10
F1 10.8.201.108 ==> 10.8.201.10 INVITE
INVITE sip:1000@10.8.201.10;user=phone SIP/2.0
Via: SIP/2.0/UDP 10.8.201.108;branch=z9hG4bKacsiJkDGd
From: <sip:8000@10.8.201.108>;tag=1c5354
To: <sip:1000@10.8.201.10>
Call-ID: 534366556655skKw-8000--1000@10.8.201.108
CSeq: 18153 INVITE
Contact: <sip:8000@10.8.201.108;user=phone>
3Com VCX V7122 SIP VoIP Gateway User Manual
Figure 60, describes SIP messages exchanged between VCX
INVITE
Trying
Ringing
200 OK
Ack
BYE
200 OK
MP-108
10.8.201.108
F1
F2
F3
F4
F5
F6
F7
157