SIP Service Examples
| Single Line Extension |
|
| |
| In the representation of the call flows associated to these services: |
|
|
| - |
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.
|
|
| - |
The Via and Max-Forwards header fields are never shown.
|
|
| - |
The "180 Trying" messages are not shown.
|
|
| - |
By default, when there is a message body, the Content-Type is "application/sdp".
|
|
| - |
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".
|
|
|
| In the context of these illustrations, mnemonics are used for To/From's tag parameter and Call-ID values,
according to the following rules: |
|
|
| - |
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).
|
|
| - |
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.
|
|
|
Navigation Tip:
Click on the sequence-diagram below, then on "Next" |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
