[Freeswitch-users] Freeswitch drops calls after 32 seconds

MikeKulls freeswitch at mikesdriveway.com
Fri Apr 3 13:11:24 UTC 2020 

I've installed freeswitch on a Raspberry PI 3 with pretty much bog stock 
config. The only change I've done is to delete the ipv6 profiles and 
changed the default password. I've connected a few different clients, 3 
soft phones and 2 ATAs. When making calls with some of the clients the 
calls are dropped after 32 seconds. For other clients the calls will 
proceed for half an hour no issues. I have absolutely no complexity 
here, it's all internal phones on the local /24 lan. There are no 
firewalls, traffic only goes via a switch. I have no external SIP 
gateway, none of the clients are behind a NAT. I've done extensive 
googling and everything I find talks about NAT issues and VPNs, multiple 
subnets etc. I'm not running any of that. Packet capture and more 
details below.


Some of the things I've tried

- complete OS and freeswitch reinstall on the PI

- disable IPv6 on the PI (made a big improvement, now the remote phone 
rings instantly instead of long delay)

- full OS update before installing freeswitch

- tried clients with both UDP and TCP

- install freeswitch on CentOS 7.

- Disable SIP ALG on router (traffic not going through router anyway)

- Tried all devices on a different network switch

- Tried client options like "use rport" etc




What works:

- Cisco SPA3102 ATA

- Voiper latest version on Windows


What doesn't work

- Latest Voiper on android

- Older version of voiper on windows

- Billion 7404VGP

- Android version of Voip by antisip



TShark capture of a call dropping. IPs are:

192.168.1.245 Freeswitch

192.168.1.225 Windows PC with older copy of voiper

192.168.1.202 Cisco ATA


     1 0.000000000 192.168.1.225 â 192.168.1.245 SIP/SDP 1038 Request: 
INVITE sip:1004 at 192.168.1.245;transport=UDP |
     2 0.005573031 192.168.1.245 â 192.168.1.225 SIP 917 Status: 407 
Proxy Authentication Required |
     3 0.011167520 192.168.1.225 â 192.168.1.245 SIP 408 Request: ACK 
sip:1004 at 192.168.1.245;transport=UDP |
     4 0.016217586 192.168.1.225 â 192.168.1.245 SIP/SDP 1314 Request: 
INVITE sip:1004 at 192.168.1.245;transport=UDP |
     5 0.037157271 192.168.1.245 â 192.168.1.225 SIP 413 Status: 100 
Trying |
     6 0.094830064 192.168.1.245 â 192.168.1.202 SIP/SDP 1283 Request: 
INVITE sip:1004 at 192.168.1.202:5083;transport=tcp |
     7 0.115792718 192.168.1.202 â 192.168.1.245 SIP 365 Status: 100 
Trying |
     8 0.115932040 192.168.1.245 â 192.168.1.202 TCP 54 5060 â 5083 
[ACK] Seq=1230 Ack=312 Win=63784 Len=0
     9 0.124784941 192.168.1.202 â 192.168.1.245 SIP 526 Status: 180 
Ringing |
    10 0.124863118 192.168.1.245 â 192.168.1.202 TCP 54 5060 â 5083 
[ACK] Seq=1230 Ack=784 Win=63784 Len=0
    11 0.151217241 192.168.1.245 â 192.168.1.225 SIP/SDP 1205 Status: 
183 Session Progress |
    12 2.263254019 192.168.1.202 â 192.168.1.245 SIP/SDP 901 Status: 200 
OK |
    13 2.263406934 192.168.1.245 â 192.168.1.202 TCP 54 5060 â 5083 
[ACK] Seq=1230 Ack=1631 Win=63784 Len=0
    14 2.272446033 192.168.1.245 â 192.168.1.202 SIP 471 Request: ACK 
sip:1004 at 192.168.1.202:5083;transport=tcp |
    15 2.284211777 192.168.1.245 â 192.168.1.225 SIP/SDP 1169 Status: 
200 OK |
    16 2.469876726 192.168.1.202 â 192.168.1.245 TCP 60 5083 â 5060 
[ACK] Seq=1631 Ack=1647 Win=16000 Len=0
    17 2.784653094 192.168.1.245 â 192.168.1.225 SIP/SDP 1169 Status: 
200 OK |
    18 3.785916037 192.168.1.245 â 192.168.1.225 SIP/SDP 1169 Status: 
200 OK |
    19 5.787085997 192.168.1.245 â 192.168.1.225 SIP/SDP 1169 Status: 
200 OK |
    20 8.903231371 192.168.1.245 â 192.168.1.225 TCP 54 5060 â 56460 
[ACK] Seq=1 Ack=1 Win=501 Len=0
    21 8.903781836 192.168.1.225 â 192.168.1.245 TCP 60 [TCP ACKed 
unseen segment] 56460 â 5060 [ACK] Seq=1 Ack=2 Win=8212 Len=0
    22 9.788128841 192.168.1.245 â 192.168.1.225 SIP/SDP 1169 Status: 
200 OK |
    23 13.788284085 192.168.1.245 â 192.168.1.225 SIP/SDP 1169 Status: 
200 OK |
    24 17.788442453 192.168.1.245 â 192.168.1.225 SIP/SDP 1169 Status: 
200 OK |
    25 20.361180947 192.168.1.225 â 192.168.1.245 UDP 60 5060 â 5060 Len=4
    26 21.788537538 192.168.1.245 â 192.168.1.225 SIP/SDP 1169 Status: 
200 OK |
    27 25.788690954 192.168.1.245 â 192.168.1.225 SIP/SDP 1169 Status: 
200 OK |
    28 29.789847278 192.168.1.245 â 192.168.1.225 SIP/SDP 1169 Status: 
200 OK |
    29 32.583226442 192.168.1.245 â 192.168.1.202 TCP 54 [TCP 
Keep-Alive] 5060 â 5083 [ACK] Seq=1646 Ack=1631 Win=63784 Len=0
    30 32.584076227 192.168.1.202 â 192.168.1.245 TCP 60 [TCP Keep-Alive 
ACK] 5083 â 5060 [ACK] Seq=1631 Ack=1647 Win=16000 Len=0
    31 33.790019961 192.168.1.245 â 192.168.1.225 SIP/SDP 1169 Status: 
200 OK |
    32 34.284637050 192.168.1.245 â 192.168.1.225 SIP 704 Request: BYE 
sip:1002 at 192.168.1.225:5060;transport=UDP |
    33 34.327728390 192.168.1.245 â 192.168.1.202 SIP 672 Request: BYE 
sip:1004 at 192.168.1.202:5083;transport=tcp |
    34 34.344437951 192.168.1.202 â 192.168.1.245 SIP 381 Status: 200 OK |
    35 34.393228415 192.168.1.245 â 192.168.1.202 TCP 54 5060 â 5083 
[ACK] Seq=2265 Ack=1958 Win=63784 Len=0
    36 34.422931003 192.168.1.225 â 192.168.1.245 SIP 466 Status: 200 OK |
    37 38.352414375 192.168.1.225 â 192.168.1.245 TCP 60 [TCP ACKed 
unseen segment] 56460 â 5060 [PSH, ACK] Seq=1 Ack=2 Win=8212 Len=4
    38 38.352610259 192.168.1.245 â 192.168.1.225 TCP 56 [TCP Previous 
segment not captured] 5060 â 56460 [PSH, ACK] Seq=2 Ack=5 Win=501 Len=2
    39 38.393526512 192.168.1.225 â 192.168.1.245 TCP 60 [TCP ACKed 
unseen segment] 56460 â 5060 [ACK] Seq=5 Ack=4 Win=8212 Len=0

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