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SIP IP Phone to SIP IP Phone: Call Setup and Disconnect
C-11
Call Trace The following call trace shows a successful call setup between two, on-
network IP phones. In this example, the called party terminates the call.
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SIP Headers
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sip-req: INVITE sip:5120@192.168.36.180 SIP/2.0 [192.168.6.21:50623-
>192.168.36.180:5060]
Header: Via: SIP/2.0/UDP 192.168.6.21:5060
Header: From: sip:5121@192.168.6.21
Header: To: <sip:5120@192.168.36.180>
Header: Call-ID: c2943000-e0563-2a1ce-2e323931@192.168.6.21
Header: CSeq: 100 INVITE
Header: Expires: 180
Header: User-Agent: Cisco IP Phone/ Rev. 1/ SIP enabled
Header: Accept: application/sdp
Header: Contact: sip:5121@192.168.6.21:5060
Header: Content-Type: application/sdp
Header: Content-Length: 219
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SDP Headers
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Header: v=0
Header: o=CiscoSystemsSIP-IPPhone-UserAgent 16264 18299 IN IP4 192.168.6.21
Header: s=SIP Call
Header: c=IN IP4 192.168.6.21
Header: t=0 0
Header: m=audio 25282 RTP/AVP 0 101
Header: a=rtpmap:0 pcmu/8000
Header: a=rtpmap:101 telephone-event/8000
Header: a=fmtp:101 0-11
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SIP Headers
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sip-res: SIP/2.0 100 Trying [192.168.36.180:5060->192.168.6.21:5060]
Header: Via: SIP/2.0/UDP 192.168.6.21:5060
Header: From: <sip:5121@192.168.6.21:5060>
Header: To: <sip:5120@192.168.36.180:5060>
Header: Call-ID: c2943000-e0563-2a1ce-2e323931@192.168.6.21
Header: CSeq: 100 INVITE
Header: Content-Length: 0
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SIP Headers
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sip-req: INVITE sip:5120@192.168.36.200:5060;user=phone SIP/2.0 [192.168.36.180:5060-
>192.168.36.200:5060]
Header: Via: SIP/2.0/UDP 192.168.36.180:5060;branch=1
Header: Via: SIP/2.0/UDP 192.168.6.21:5060
Header: From: <sip:5121@192.168.6.21:5060>
Header: To: <sip:5120@192.168.36.180:5060>
Header: Call-ID: c2943000-e0563-2a1ce-2e323931@192.168.6.21
Header: CSeq: 100 INVITE
Header: Proxy-Authorization: Basic VovidaClassXSwitch
Header: Expires: 180
Header: Record-Route: <sip:5120@192.168.36.180:5060;maddr=192.168.36.180>
Header: Contact: <sip:5121@192.168.6.21:5060>
Header: Content-Type: application/sdp
Header: Content-Length: 219
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SDP Headers
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Header: v=0
Header: o=CiscoSystemsSIP-IPPhone-UserAgent 16264 18299 IN IP4 192.168.6.21
Header: s=SIP Call
Header: c=IN IP4 192.168.6.21
Header: t=0 0
Header: m=audio 25282 RTP/AVP 0 101
Header: a=rtpmap:0 pcmu/8000
Header: a=rtpmap:101 telephone-event/8000