Sip Call Flow - 3Com VCX V7111 User Manual

4
Make a call! Pick up the phone connected to port #1 of the first 8FXS and dial 102 (to the
phone connected to port #2 of the same gateway). Listen out for progress tones at the
calling endpoint and for ringing tone at the called endpoint. Answer the called endpoint,
talk into the calling endpoint, and check the voice quality. Dial 201 from the phone
connected to port #1 of the first 8FXS gateway; the phone connected to port #1 of the
second 8FXS rings. Answer the call and check the voice quality.

SIP Call Flow

The following Call Flow describes SIP messages exchanged between two 8FXS gateways
during simple call.
Phone "6000" dials "2000", sending INVITE message to Gateway 10.8.201.161.
Figure 79
SIP Call Flow
MP-108
10.8.201.158
F1 10.8.201.158 ==> 10.8.201.161 INVITE
INVITE sip:6000@10.8.201.161;user=phone SIP/2.0
Via: SIP/2.0/UDP 10.8.201.158;branch=z9hG4bKacolwbzYF
From: <sip:2000@10.8.201.158>;tag=1c3535
To: <sip:6000@10.8.201.161>
Call-ID: 2123353775377NrpL-2000--6000@10.8.201.158
CSeq: 20214 INVITE
Contact: <sip:2000@10.8.201.158;user=phone>
User-Agent: 3Com-Sip-Gateway/8FXS/v.4.20.299.410
3Com VCX V7111 VoIP SIP Gateway User Manual
INVITE F1
Ringing F2
200 OK F3
ACK F4
BYE F5
200 OK F6
MP-108
10.8.201.161
169