Snom ONE IP Technical Manual page 175

Deploying the snom ONE IP Telephone System
506
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Message body: SIP requests and responses can both contain message bodies.
The content of the message body is usually a session description and contains
syntax as shown in the message below.
SIP URI
Headers
Message
Body
Start Line
(Response)
Headers
Figure B-3. Message Content
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Headers: SIP header fields provide additional information about the message.
Common headers are shown below (for a complete list, see Table B-7).
Table B-5 Common SIP Headers
SIP Header
To
From
INVITE sip:513@192.168.1.119:1036;transport=tls;line=islsi
Via: SIP/2.0/TLS 192.168.1.251:5061;branch=z9hG4bK-2ec1bde
From: "Cell Phone BC" <sip:7788821234@cs410.snom.com:5066;
To: "Jerry McDonald" <sip:513@cs410.snom.com>
Call-ID: 3eb9a3b0@pbx
CSeq: 14649 INVITE
Max-Forwards: 70
Contact: <sip:513@192.168.1.251:5061;transport=tls>
v=0
o=- 20105 20105 IN IP4 192.168.1.251
s=-
c=IN IP4 192.168.1.251
t=0 0
m=audio 62116 RTP/AVP 0 8 9 2 3 18 101
a=crypto:1 AES_CM_128_HMAC_SHA1_32 inline:Egjy8tgmY65IlnTn
a=rtpmap:0 pcmu/8000
a=rtpmap:8 pcma/8000
a=rtpmap:9 g722/8000
SIP/2.0 200 Ok
Via: SIP/2.0/UDP 192.168.1.251:5060;branch=z9hG4bK-690e2b8
From: "Jennifer Hanson" <sip:523@cs410.snom.com>;tag=45498
To: "Jennifer Hanson" <sip:523@cs410.snom.com>
Call-ID: ft836yqi@pbx
CSeq: 19493 MESSAGE
Content-Length: 0
Address of the called party or the destination party
Calling party or the caller-ID in some cases
Description