Alcatel-Lucent 7330 - Figure 5-3 Call Flow of a SIP Call Originating from the ONT

5 — VoIP overview
5-14 March 2011 Alcatel-Lucent 7330/7302 ISAM FTTN R04.02.42a
ONT Product Information Guide Edition 01 3FE 54199 AAAA TCZZA
Figure 5-3 Call flow of a SIP call originating from the ONT
Figure 5-4 shows the call flow for a SIP call that is terminated at the ONT.
ACK
INVITE (collected digits)
100 TRYING
180 RINGING
PRACK
200 OK (PRACK)
200 OK (INVITE)
Off hook
First digital dialed
Stop dial tone/stutter tone
Remaining digits dialed
Send ring back tone
Stop ring back tone
Send dial tone or stutter tone
18585
ONT Softswitch
Speech path established
Phone