Hi folks,
I've finally gotten around to finishing up the coding of PRACK and UPDATE
for the UAC. I'm writing some test cases for it now. I haven't put in all of
the glare conditions yet nor the cases where 183s get delivered out of
order. Keep in mind, I have only implemented and tested the UAC portion of
rfc 3262.
Case 1: Basic INV(offer) / 183 (answer)
Case 2: INV(offer) + 183 (answer) + UPDATE in each direction
Case 3: INV(offer) + 183 (answer) followed by 183 with no SDP
Case 4: INV(offer) + 183 (no SDP) + 200-INV(answer)
Case 5: INV + 183 + 200 (offer) + ACK(answer)
Case 6: INV + 183 (offer) + PRACK(answer)
Case 7: show retransmission of 183
Case 8: delay 200-PRACK to force PRACK retransmission
Case 1: Basic INV(offer) / 183 (answer)
Alice Bob
| |
| |
| |
|(1) INVITE(offer) |
|----------------------->|
| |
| |
|(2) 183(answer) |
|<-----------------------|
| |
| |
|(3) PRACK(rseq=1) |
|----------------------->|
| |
| |
|(4) 200(PRACK) |
|<-----------------------|
| |
| |
|(5) 200(INVITE) |
|<-----------------------|
| |
| |
|(6) ACK |
|----------------------->|
| |
| |
| |
Case 2: INV(offer) + 183 (answer) + UPDATE in each direction
Alice Bob
| |
| |
| |
|(1) INVITE(offer1) |
|----------------------->|
| |
| |
|(2) 183(answer1) |
|<-----------------------|
| |
| |
|(3) PRACK(rseq=1) |
|----------------------->|
| |
| |
|(4) 200-PRACK |
|<-----------------------|
| |
| |
|(5) UPDATE(offer2) |
|----------------------->|
| |
| |
|(6) 200-UPDATE(answer2) |
|<-----------------------|
| |
| |
|(7) UPDATE(offer3) |
|<-----------------------|
| |
| |
|(8) 200-UPDATE(answer3) |
|----------------------->|
| |
| |
|(9) 200-INVITE |
|<-----------------------|
| |
| |
|(10) ACK |
|----------------------->|
| |
| |
| |
| |
Case 3: INV(offer) + 183 (answer) followed by 183 with no SDP
Alice Bob
| |
| |
| |
|(1) INVITE(offer1) |
|----------------------->|
| |
| |
|(2) 183(answer2) |
|<-----------------------|
| |
| |
|(3) PRACK(rseq=1) |
|----------------------->|
| |
| |
|(4) 200(PRACK) |
|<-----------------------|
| |
| |
|(5) 183 |
|<-----------------------|
| |
| |
|(6) PRACK(rseq=2) |
|----------------------->|
| |
| |
|(7) 200(PRACK) |
|<-----------------------|
| |
| |
|(8) 183(offer2) |
|<-----------------------|
| |
| |
|(9) PRACK(rseq=3,answer2)
|----------------------->|
| |
| |
|(10) 200(PRACK) |
|<-----------------------|
| |
| |
|(11) 200(INVITE) |
|<-----------------------|
| |
| |
|(12) ACK |
|----------------------->|
| |
| |
| |
| |
Case 4: INV(offer) + 183 (no SDP) + 200-INV(answer)
Alice Bob
| |
| |
| |
|(1) INVITE(offer) |
|----------------------->|
| |
| |
|(2) 183(rseq=1) |
|<-----------------------|
| |
| |
|(3) PRACK(rseq=1) |
|----------------------->|
| |
| |
|(4) 200-PRACK |
|<-----------------------|
| |
| |
|(5) 200-INVITE(answer) |
|<-----------------------|
| |
| |
|(6) ACK |
|----------------------->|
| |
| |
| |
| |
Case 5: INV + 183 + 200 (offer) + ACK(answer)
Alice Bob
| |
| |
| |
|(1) INVITE |
|----------------------->|
| |
| |
|(2) 183(rseq=1) |
|<-----------------------|
| |
| |
|(3) PRACK(rseq=1) |
|----------------------->|
| |
| |
|(4) 200-PRACK |
|<-----------------------|
| |
| |
|(5) 200-INVITE(offer) |
|<-----------------------|
| |
| |
|(6) ACK(answer) |
|----------------------->|
| |
| |
| |
| |
Case 6: INV + 183 (offer) + PRACK(answer)
Alice Bob
| |
| |
| |
|(1) INVITE |
|----------------------->|
| |
| |
|(2) 183(rseq=1,offer) |
|<-----------------------|
| |
| |
|(3) PRACK(rseq=1,answer)|
|----------------------->|
| |
| |
|(4) 200-PRACK |
|<-----------------------|
| |
| |
|(5) 200-INVITE |
|<-----------------------|
| |
| |
|(6) ACK |
|----------------------->|
| |
| |
| |
| |
Case 7: show retransmission of 183
| |
| |
| |
|(1) INVITE(offer) |
|----------------------->|
| |
| |
|(2) 183(answer) |
|<-----------------------|
| |
| |
|(3) PRACK(rseq=1) |
|----------------------->|
| |
| |
|(4) 183(answer) ! retransmission
|<-----------------------|
| |
| |
|(5) PRACK(rseq=1) |
|----------------------->|
| |
| |
|(6) 200-PRACK |
|<-----------------------|
| |
| |
|(7) 200-INVITE |
|<-----------------------|
| |
| |
|(8) ACK |
|----------------------->|
| |
| |
| |
| |
Case 8: delay 200-PRACK to force PRACK retransmission
Alice Bob
| |
| |
| |
|(1) INVITE(offer) |
|----------------------->|
| |
| |
|(2) 183(answer) |
|<-----------------------|
| |
| |
|(3) PRACK(rseq=1) |
|----------------------->|
| |
| |
|(4) PRACK(rseq=1) |
|----------------------->|
| |
| |
|(5) 200-PRACK |
|<-----------------------|
| |
| |
|(6) 200-INVITE |
|<-----------------------|
| |
| |
|(7) ACK |
|----------------------->|
| |
| |
| |
| |
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