[Spce-user] calls dropped after 30 seconds

[Jirka Jirout]

Hello,

please accept my apologies if my question is stupid, but I have not been able to find a solution even after searching the archives.

I am trying to make a call between two clients. The cal is set up fine, I have both audio streams working, but after 30 seconds, the call gets dropped. The server is apparently unaware of the successfull connection and sends BYE to both parties. After both acknowledge the message with 200 OK, the calling client sends "SIP/2.0 481 Dialog/Transaction Does Not Exist" to the server.

Does the server expect the called party to confirm the connection in some other way than just "200 OK"?

The behaviour is the same with several software clients. I am setting a Cisco phone here just to make sure, but expect the same since it is the server, who instructs the parties to deop the connection.

The diagram looks like this:
Calling party		Server		Called party	2nd reg of called party
    |                   |                   |                   |
1 : |U------INVITE----->|                   |                   |
2 : |<-100 Trying/INVI-U|                   |                   |
3 : |<-407 Proxy Authe-U|                   |                   |
4 : |U-------ACK------->|                   |                   |
5 : |<-100 Trying/INVI-U|                   |                   |
6 : |                   |U------INVITE----->|                   |
7 : |                   |U----------------INVITE--------------->|
8 : |                   |<-100 Trying (sen-U|                   |
9 : |                   |<-180 Ringing/INV-U|                   |
10: |<-180 Ringing/INV-U|                   |                   |
11: |                   |U----------------INVITE--------------->|
12: |                   |U----------------INVITE--------------->|
13: |<-----OPTIONS-----U|                   |                   |
14: |U--200 OK/OPTIONS->|                   |                   |
15: |                   |U----------------INVITE--------------->|
16: |                   |<--200 OK/INVITE--U|                   |
17: |<--200 OK/INVITE--U|                   |                   |
18: |<--200 OK/INVITE--U|                   |                   |
19: |                   |<--200 OK/INVITE--U|                   |
20: |<--200 OK/INVITE--U|                   |                   |
21: |U-------ACK------->|                   |                   |
22: |U-------ACK------->|                   |                   |
23: |U-------ACK------->|                   |                   |
24: |                   |<--200 OK/INVITE--U|                   |
25: |<--200 OK/INVITE--U|                   |                   |
26: |U-------ACK------->|                   |                   |
27: |                   |<--200 OK/INVITE--U|                   |
28: |<--200 OK/INVITE--U|                   |                   |
29: |U-------ACK------->|                   |                   |
30: |<--200 OK/INVITE--U|                   |                   |
31: |U-------ACK------->|                   |                   |
32: |                   |<--200 OK/INVITE--U|                   |
33: |<--200 OK/INVITE--U|                   |                   |
34: |U-------ACK------->|                   |                   |
35: |<--200 OK/INVITE--U|                   |                   |
36: |U-------ACK------->|                   |                   |
37: |<-----OPTIONS-----U|                   |                   |
38: |U--200 OK/OPTIONS->|                   |                   |
39: |<--200 OK/INVITE--U|                   |                   |
40: |U-------ACK------->|                   |                   |
41: |<--200 OK/INVITE--U|                   |                   |
42: |U-------ACK------->|                   |                   |
43: |                   |<--200 OK/INVITE--U|                   |
44: |                   |U-------ACK------->|                   |
45: |<-------BYE-------U|                   |                   |
46: |                   |U-------BYE------->|                   |
47: |                   |<----200 OK/BYE---U|                   |
48: |<-------BYE-------U|                   |                   |
49: |U----200 OK/BYE--->|                   |                   |
50: |U-481 Dialog/Tran->|                   |                   |

regards, jj