src/samples/sample03_sip_(from_wikipedia).mscin
# SIP protocol (source: wikipedia)
msc {
UAS, UAC;
UAS -> UAC [label="INVITE"];
UAS <- UAC [label="100 Trying"];
UAS <- UAC [label="180 Ringing"];
--- [label="the client plays ringing"];
UAS <- UAC [label="200 Ok"];
UAS -> UAC [label="ACK"];
...;
--- [label="the client hangs up"];
UAS <- UAC [label="BYE"];
UAS <- UAC [label="200 Ok"];
}