Comments
The following steps describe the sequence of messages exchanged between the user
agents:
• The following messages are exchanged while establishing a session:
1. UA1 sends an INVITE request message to invite UA2 to participate in the
session.
2. UA2 responds with a 100 - Trying response message to indicate that the
request has been received.
3. UA2 sends the 180-Ringing response to indicate that UA2 is ringing.
4. UA2 sends the 200-OK response to inform that the user at UA2 has picked
up the call.
5. UA1 sends the ACK request to confirm receipt of the 200-OK response.
• The following messages are exchanged while terminating a session:
6. When the user at UA1 ends the call, a BYE request message is sent to UA2.
7. UA2 responds with the 200-OK message and informs the user at UA2 that
the session has ended.
Posted by sagitraz
1. Initiate a call - A UAC initiates a call by sending a transaction to a SIP Proxy Server. The first transaction asks the Proxy Server if the User Agent Client can join the network and start a call. The Proxy Server checks the UAC’s credentials and capabilities
2. Invite the called party - If the UAC checks out, Proxy invites the requested UAS to join the call
3. Complete the media connection - If both User Agents have common codecs and other capabilities, they can talk directly to each other. They are expected to notify the Proxy when their call is terminated
Posted by anders
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