October 2008
Beginner
220 pages
5h 26m
English
Content preview from Hacking VoIP
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SIP Messages
A SIP message usually contains a few more items, including the following:
| To Field The recipient of the original SIP message |
| From Field The sender of the SIP message |
| Contact Field The IP address of the SIP User Agent |
| Call-ID Field A number that uniquely identifies a given call between two User Agents; all SIP messages that belong to a single communication stream (a single phone call) use the same Call-ID so that the packets will be grouped correctly |
| CSeq Field Sequence number of SIP messages; a sequence number is a value that shows the order of packets when several packets are sent between entities, and it usually increments by one |
Content-Type Field The MIME type for the payload, such as application/sdp |
| Content-Length Field The size of ... |
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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