Version 5.6
369
November 2008
SIP User's Manual
7. IP Telephony Capabilities
7.14 Configuration Examples
7.14.1 SIP Call Flow
The SIP call flow (shown in the following figure), describes SIP messages exchanged
between two devices during a simple call. In this call flow example, device (10.8.201.158)
with phone number ‘6000’ dials device (10.8.201.161) with phone number ‘2000’.
Figure
7-2: SIP Call Flow
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>
User-Agent: Audiocodes-Sip-Gateway/Mediant 2000/v.5.40.010.006
Supported: 100rel,em
Allow: REGISTER,OPTIONS,INVITE,ACK,CANCEL,BYE,
NOTIFY,PRACK,REFER,INFO
Content-Type: application/sdp
Content-Length: 208
v=0
o=AudiocodesGW 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):
Summary of Contents for Mediant 2000
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