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Only the more relevant header fields are shown: From,
To,
Call-ID,
Cseq,
Contact,
Route,
Record-Route,
and some other ones depending on the example.
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The Via and Max-Forwards header fields are never shown.
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The "100 Trying" messages are not shown.
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By default, when there is a message body, the Content-Type is "application/sdp".
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The "example.com"
domain has been renamed "ex.com" and the "client" subdomain for
"atlanta.ex.com", "biloxi.ex.com" and "chicago.ex.com" has been
replaced respectively by "u1", "u2" and "u3".
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| In the context of these illustrations, mnemonics are used for To/From's tag parameter and Call-ID values,
according to the following rules: |
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a tag is under the form: <x>-tag, where x is typically a letter identifying the UA
(a for Alice, b for Bob, c for Carol). When other tags for the same UA are required
in an example, a digit is added (e.g. a2, b2).
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the Call-ID for a Session is under the form: <xy>-cid, where x is the
tag identifier of the session's initiator and y the tag identifier of the recipient: e.g. ab-cid
when Alice calls Bob.
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