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

5 — VoIP overview
5-14 November 2013 Alcatel-Lucent 7302 ISAM | 7330 ISAM FTTN | 7360 ISAM FX ONT R04.06.02
Edition 01 3FE 55873 AAAA TCZZA
ONT Product Information Guide
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