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User Agent to User Agent: Call Waiting
C-79
Call Trace The following call trace shows a third party attempting to connect to a phone
that is engaged in conversation with another phone.
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A calls B
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SIP Headers
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sip-req: INVITE sip:5220@192.168.66.180:5060;user=phone SIP/2.0 [192.168.66.1:5060-
>192.168.66.180:5060]
Header: Via: SIP/2.0/UDP 192.168.66.1:5060
Header: From: UserAgent<sip:5221@192.168.66.1:5060;user=phone>
Header: To: 5220<sip:5220@192.168.66.180:5060;user=phone>
Header: Call-ID: 4732a6465cfdffbdc0d38708c0728708@192.168.66.1
Header: CSeq: 1 INVITE
Header: Subject: VovidaINVITE
Header: Contact: <sip:5221@192.168.66.1:5060;user=phone>
Header: Content-Type: application/sdp
Header: Content-Length: 168
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SDP Headers
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Header: v=0
Header: o=- 1528076688 1528076688 IN IP4 192.168.66.1
Header: s=VOVIDA Session
Header: c=IN IP4 192.168.66.1
Header: t=3177769010 0
Header: m=audio 56104 RTP/AVP 0
Header: a=rtpmap:0 PCMU/8000
Header: a=ptime:20
Header: 7
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SIP Headers
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sip-res: SIP/2.0 100 Trying [192.168.66.180:5060->192.168.66.1:5060]
Header: Via: SIP/2.0/UDP 192.168.66.1:5060
Header: From: UserAgent<sip:5221@192.168.66.1:5060;user=phone>
Header: To: 5220<sip:5220@192.168.66.180:5060;user=phone>
Header: Call-ID: 4732a6465cfdffbdc0d38708c0728708@192.168.66.1
Header: CSeq: 1 INVITE
Header: Content-Length: 0
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SIP Headers
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sip-req: INVITE sip:5220@192.168.66.200:5060;user=phone SIP/2.0 [192.168.66.180:5060-
>192.168.66.200:5060]
Header: Via: SIP/2.0/UDP 192.168.66.180:5060;branch=1
Header: Via: SIP/2.0/UDP 192.168.66.1:5060
Header: From: UserAgent<sip:5221@192.168.66.1:5060;user=phone>
Header: To: 5220<sip:5220@192.168.66.180:5060;user=phone>
Header: Call-ID: 4732a6465cfdffbdc0d38708c0728708@192.168.66.1
Header: CSeq: 1 INVITE
Header: Proxy-Authorization: Basic 123
Header: Subject: VovidaINVITE
Header: Record-Route: <sip:5220@192.168.66.180:5060;maddr=192.168.66.180>
Header: Contact: <sip:5221@192.168.66.1:5060;user=phone>
Header: Content-Type: application/sdp
Header: Content-Length: 168
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SDP Headers
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Header: v=0
Header: o=- 1528076688 1528076688 IN IP4 192.168.66.1
Header: s=VOVIDA Session
Header: c=IN IP4 192.168.66.1
Header: t=3177769010 0
Header: m=audio 56104 RTP/AVP 0
Header: a=rtpmap:0 PCMU/8000
Header: a=ptime:20