Cisco Systems 1.3.0 manual 174

Ad Hoc Conference Call Between User Agents

	SDP Headers
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Header:	v=0
Header:	o=- 979501686 979501686 IN IP4 192.168.46.2
Header:	s=VOVIDA Session
Header:	c=IN IP4 192.168.46.2
Header:	t=3177798665 0
Header:	m=audio 23466 RTP/AVP 0
Header:	a=rtpmap:0 PCMU/8000
Header:	a=ptime:20
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	SIP Headers
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sip-res:	SIP/2.0 200 OK [192.168.46.180:5060->192.168.46.1:5060]
Header:	Via: SIP/2.0/UDP 192.168.46.1:5060
Header:	From: seymour<sip:5201@192.168.46.1:5060;user=phone>
Header:	To: 5202<sip:5202@192.168.46.180:5060;user=phone>
Header:	Call-ID: 64133833318102@192.168.46.1
Header:	CSeq: 3 INVITE
Header:	Contact: <sip:5202@192.168.46.2:5060>
Header:	Record-Route:

<sip:5202@192.168.46.180:5060;maddr=192.168.46.180>,<sip:5202@192.168.46.180:5060;maddr=1

92.168.46.180>

Header:	Content-Type: application/sdp
Header:	Content-Length: 166
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	SDP Headers
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Header:	v=0
Header:	o=- 979501686 979501686 IN IP4 192.168.46.2
Header:	s=VOVIDA Session
Header:	c=IN IP4 192.168.46.2
Header:	t=3177798665 0
Header:	m=audio 23466 RTP/AVP 0
Header:	a=rtpmap:0 PCMU/8000
Header:	a=ptime:20
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	SIP Headers
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sip-req:	ACK sip:5202@192.168.46.180:5060;maddr=192.168.46.180 SIP/2.0
[192.168.46.1:5060->192.168.46.180:5060]
Header:	Via: SIP/2.0/UDP 192.168.46.1:5060
Header:	From: seymour<sip:5201@192.168.46.1:5060;user=phone>
Header:	To: 5202<sip:5202@192.168.46.180:5060;user=phone>
Header:	Call-ID: 64133833318102@192.168.46.1
Header:	CSeq: 3 ACK
Header:	Route:

<sip:5202@192.168.46.180:5060;maddr=192.168.46.180>,<sip:5202@192.168.46.2:5060>

Header:	Content-Length: 0
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	SIP Headers
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sip-req:	ACK sip:5202@192.168.46.2:5060 SIP/2.0	[192.168.46.180:5060-
>192.168.46.2:5060]
Header:	Via: SIP/2.0/UDP 192.168.46.180:5060;branch=4
Header:	Via: SIP/2.0/UDP 192.168.46.180:5060;branch=2
Header:	Via: SIP/2.0/UDP 192.168.46.1:5060
Header:	From: seymour<sip:5201@192.168.46.1:5060;user=phone>
Header:	To: 5202<sip:5202@192.168.46.180:5060;user=phone>
Header:	Call-ID: 64133833318102@192.168.46.1
Header:	CSeq: 3 ACK
Header:	Content-Length: 0
=================================================================
sip-req:	Second call completed, now place second call on hold

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SIP Headers

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C-174