Owner manual

IP Voice Transmission

2.4

The answers to the SIP messages are numerically coded as the case is with the http

protocol. Below are the most important ones:

 1XX  information messages (100  trying, 180  ringing, 183 -

progress);

 2XX  successful request completion (200  OK);

 3XX  request forwarding needed (302  temporarily moved, 305  use

Proxy);

 4XX  error (403  forbidden, 486  busy here);

 5XX  server error (500  Server Internal Error, 501  not implemented);

 6XX  global failure (606  not acceptable).

VoIP SIP Phone

SIP Proxy

SIP/SDP INVITE

100 Trying

183 Session progress

200 OK

SIP ACK

SIP BYE

200 OK

RTP Stream

SIP Message Sending during Call Set-up and Cancellation