Answers an incoming call or session.
|200 OK||Session Description Protocol (SDP) message that is sent by an answerer in response to an offer that is received from an offerer.|
|183 Session Progress||Establishes media (SDP) but does not answer. Is equivalent to a SIP status code 183 with SDP.|
|180 Ringing||Is equivalent to a SIP status code 180 Ringing without SDP.|
You can use only sip status code as a value.