Use of 183 Session Progress
Originating PSTN
Network
SIP Proxy
Server
Terminating PSTN
Network
IAM
IAM
ACM
Ingress
Gateway
Egress
Gateway
INVITE
INVITE
100 Trying
ACM
100 Trying
183 Trying
183 Trying
One way voice path
Two way voice path
ANM
200 OK
200 OK
ANM
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