funpig:

Session Initiation Protocol
Request-Line: INVITE sip:3450@192.168.2.94:64550 SIP/2.0
Method: INVITE
Request-URI: sip:3450@192.168.2.94:64550
Request-URI User Part: 3450
Request-URI Host Part: 192.168.2.94
Request-URI Host Port: 64550
[Resent Packet: False]
Message Header
Via: SIP/2.0/UDP 192.168.2.51:5060;branch=z9hG4bK678ab923;rport
Transport: UDP
Sent-by Address: 192.168.2.51
Sent-by port: 5060
Branch: z9hG4bK678ab923
RPort: rport
From: "asterisk" <sip:asterisk@192.168.2.51>;tag=as0396138a
SIP Display info: "asterisk"
SIP from address: sip:asterisk@192.168.2.51
SIP from address User Part: asterisk
SIP from address Host Part: 192.168.2.51
SIP tag: as0396138a
To: <sip:3450@192.168.2.94:64550>
SIP to address: sip:3450@192.168.2.94:64550
SIP to address User Part: 3450
SIP to address Host Part: 192.168.2.94
SIP to address Host Port: 64550
Contact: <sip:asterisk@192.168.2.51>
Contact Binding: <sip:asterisk@192.168.2.51>
URI: <sip:asterisk@192.168.2.51>
SIP contact address: sip:asterisk@192.168.2.51
Call-ID: 67fe5a3f41b5fd6978a96b81452a8ec0@192.168.2.51
CSeq: 102 INVITE
Sequence Number: 102
Method: INVITE
User-Agent: Asterisk PBX
Max-Forwards: 70
Date: Mon, 07 Dec 2009 23:22:14 GMT
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY
Supported: replaces
Content-Type: application/sdp
Content-Length: 240
Message Body
Session Description Protocol
Session Description Protocol Version (v): 0
Owner/Creator, Session Id (o): root 18095 18095 IN IP4 192.168.2.51
Owner Username: root
Session ID: 18095
Session Version: 18095
Owner Network Type: IN
Owner Address Type: IP4
Owner Address: 192.168.2.51
Session Name (s): session
Connection Information (c): IN IP4 192.168.2.51
Connection Network Type: IN
Connection Address Type: IP4
Connection Address: 192.168.2.51
Time Description, active time (t): 0 0
Session Start Time: 0
Session Stop Time: 0
Media Description, name and address (m): audio 10004 RTP/AVP 0 101
Media Type: audio
Media Port: 10004
Media Protocol: RTP/AVP
Media Format: ITU-T G.711 PCMU
Media Format: DynamicRTP-Type-101
Media Attribute (a): rtpmap:0 PCMU/8000
Media Attribute Fieldname: rtpmap
Media Format: 0
MIME Type: PCMU
Sample Rate: 8000
Media Attribute (a): rtpmap:101 telephone-event/8000
Media Attribute Fieldname: rtpmap
Media Format: 101
MIME Type: telephone-event
Sample Rate: 8000
Media Attribute (a): fmtp:101 0-16
Media Attribute Fieldname: fmtp
Media Format: 101 [telephone-event]
Media format specific parameters: 0-16
Media Attribute (a): silenceSuppff - - - -
Media Attribute Fieldname: silenceSupp
Media Attribute Value: off - - - -
Media Attribute (a): ptime:20
Media Attribute Fieldname: ptime
Media Attribute Value: 20
Media Attribute (a): sendrecv