problems using kamailio

Peter Walber via sr-users <[email protected]>
Newsgroups gmane.comp.voip.ser
Message-ID <[email protected]>
Hello,


I try to use kamailio as webrtc-sip-gateway between my openhab smart 
home system and my doorbird doorbell with phone and camera.

I try to use the product of 
"https://github.com/florian-h05/webrtc-sip-gw". Which integrates 
kamailio together with rtpengine to the gateway.

I want to use openhab as SIP Client and have a Telekom Speedport Smart 4 
Router on the other side. The webrtc-sip-gw from florian-h05 shall be 
the software between Openhab and the speedport smart 4. On the speedport 
smart router the SIP Server is enabled and configured. I can sucessfully 
call with zoiper extern phone numbers. The doorbird als is configured 
correctly. I can call the doorbird with my zioper softphone using the 
SIP interface of the doorbird. The runtime system is a  docker container 
on debian 12.

I want to call the doorbird by SIP from my openhab SIP client.

I can initiate the call, but it doesn't establish

Here is the log from the docker container.

---------------------------------------------------------------------------------------------------
2025-08-07T07:46:57.384687165Z  9(52) INFO: <script>: HTTP Request Received
2025-08-07T07:46:57.391479050Z  9(52) INFO: <script>: START: REGISTER 
from sip:**[email protected] (IP:192.168.2.185:39510)
2025-08-07T07:46:57.391516534Z  9(52) INFO: <script>: Current Contact 
header: 
<sip:[email protected];transport=ws>;+sip.ice;reg-id=1;+sip.instance="<urn:uuid:243e461d-f0cb-4c09-9a63-f57c9bba8d6b>";expires=600
2025-08-07T07:46:57.391526535Z  9(52) INFO: <script>: Setting new 
Contact header: <sip:**[email protected]:5060>
2025-08-07T07:47:00.195739350Z  9(52) INFO: <script>: START: INVITE from 
sip:**[email protected] (IP:192.168.2.185:39510)
2025-08-07T07:47:00.195800424Z  9(52) INFO: <script>: Current Contact 
header: <sip:[email protected];transport=ws;ob>
2025-08-07T07:47:00.195811886Z  9(52) INFO: <script>: Setting new 
Contact header: 
<sip:[email protected];transport=ws;ob;alias=192.168.2.185~39510~6;alias=192.168.2.185~39510~6>
2025-08-07T07:47:00.196163528Z  9(52) INFO: <script>: MANAGE_BRANCH: New 
branch [0] to sip:**[email protected]
2025-08-07T07:47:00.196181228Z  9(52) INFO: <script>: NATMANAGE 
branch_id:0 ruri: sip:**[email protected], method:INVITE, status:<null>, 
extra_id: z9hG4bK44082210, rtpengine_manage: replace-origin 
replace-session-connection via-branch=extra rtcp-mux-demux SDES-off 
ICE=remove RTP/AVP
2025-08-07T07:47:00.196608235Z INFO: [penvq8f06ehafutk9ivf]: [control] 
Received command 'offer' from 127.0.0.1:50790
2025-08-07T07:47:00.196625247Z NOTICE: [penvq8f06ehafutk9ivf]: [core] 
Creating new call
2025-08-07T07:47:00.198519843Z INFO: [penvq8f06ehafutk9ivf]: [control] 
Replying to 'offer' from 127.0.0.1:50790 (elapsed time 0.001979 sec)
2025-08-07T07:47:01.927528447Z  9(52) INFO: <script>: START: CANCEL from 
sip:**[email protected] (IP:192.168.2.185:39510)
2025-08-07T07:47:01.927577111Z  9(52) INFO: <script>: Current Contact 
header: <null>
2025-08-07T07:47:01.927586439Z  9(52) INFO: <script>: Setting new 
Contact header: <null>
2025-08-07T07:47:09.169489716Z  7(50) INFO: <script>: WebSocket 
connection from 192.168.2.185:39510 has closed
*2025-08-07T07:47:27.355185671Z  2(45) WARNING: tm 
[../../core/forward.h:203]: msg_send_buffer(): TCP/TLS connection for 
WebSocket could not be found*
2025-08-07T07:47:27.914769340Z  9(52) INFO: <script>: HTTP Request Received
2025-08-07T07:47:27.951608347Z  9(52) INFO: <script>: START: REGISTER 
from sip:**[email protected] (IP:192.168.2.185:44816)
2025-08-07T07:47:27.951663073Z  9(52) INFO: <script>: Current Contact 
header: 
<sip:[email protected];transport=ws>;+sip.ice;reg-id=1;+sip.instance="<urn:uuid:39eac0ca-0aea-4526-a5c7-0516bc8a2d71>";expires=600
2025-08-07T07:47:27.951915520Z  9(52) INFO: <script>: Setting new 
Contact header: <sip:**[email protected]:5060>
2025-08-07T07:47:30.168546446Z  2(45) INFO: <script>: BRANCH FAILED: 
z9hG4bK4408221 + 0INFO: [penvq8f06ehafutk9ivf]: [control] Received 
command 'delete' from 127.0.0.1:36296
2025-08-07T07:47:30.168587880Z INFO: [penvq8f06ehafutk9ivf]: [core] 
Deleting call branch '' (via-branch 'z9hG4bK44082210')
2025-08-07T07:47:30.168597011Z INFO: [penvq8f06ehafutk9ivf]: [core] Call 
branch '' (via-branch 'z9hG4bK44082210') deleted, no more branches remaining
2025-08-07T07:47:30.168605215Z INFO: [penvq8f06ehafutk9ivf]: [core] 
Deleting entire call
2025-08-07T07:47:30.168612883Z INFO: [penvq8f06ehafutk9ivf]: [core] 
Final packet stats:
2025-08-07T07:47:30.168620604Z INFO: [penvq8f06ehafutk9ivf]: [core] --- 
Tag 'utenlull77', created 0:30 ago for branch ''
2025-08-07T07:47:30.168628359Z INFO: [penvq8f06ehafutk9ivf]: [core] 
---     subscribed to ''
2025-08-07T07:47:30.168636445Z INFO: [penvq8f06ehafutk9ivf]: [core] 
---     subscription for ''
2025-08-07T07:47:30.168645446Z INFO: [penvq8f06ehafutk9ivf]: [core] 
------ Media #1 (audio over UDP/TLS/RTP/SAVPF) using unknown codec
2025-08-07T07:47:30.168653691Z INFO: [penvq8f06ehafutk9ivf]: [core] 
--------- Port   192.168.2.209:23484 <> 192.168.2.185:60650, SSRC 0, 0 
p, 0 b, 0 e, 30 ts
2025-08-07T07:47:30.168661939Z INFO: [penvq8f06ehafutk9ivf]: [core] --- 
Tag '', created 0:30 ago for branch 'z9hG4bK44082210'
2025-08-07T07:47:30.168669844Z INFO: [penvq8f06ehafutk9ivf]: [core] 
---     subscribed to 'utenlull77'
2025-08-07T07:47:30.168677713Z INFO: [penvq8f06ehafutk9ivf]: [core] 
---     subscription for 'utenlull77'
2025-08-07T07:47:30.168685661Z INFO: [penvq8f06ehafutk9ivf]: [core] 
------ Media #1 (audio over RTP/AVP) using unknown codec
2025-08-07T07:47:30.168693705Z INFO: [penvq8f06ehafutk9ivf]: [core] 
--------- Port   192.168.2.209:23472 <>                :0    , SSRC 0, 0 
p, 0 b, 0 e, 30 ts
2025-08-07T07:47:30.168718608Z INFO: [penvq8f06ehafutk9ivf]: [core] 
--------- Port   192.168.2.209:23473 <>                :0     (RTCP), 
SSRC 0, 0 p, 0 b, 0 e, 30 ts
2025-08-07T07:47:30.168728065Z INFO: [penvq8f06ehafutk9ivf]: [control] 
Replying to 'delete' from 127.0.0.1:36296 (elapsed time 0.000505 sec)
*2025-08-07T07:47:30.169042099Z  2(45) INFO: <script>: Failure: <null> 
2(45) WARNING: tm [../../core/forward.h:203]: msg_send_buffer(): TCP/TLS 
connection for WebSocket could not be found*
2025-08-07T07:47:30.265075785Z  9(52) INFO: <script>: START: INVITE from 
sip:**[email protected] (IP:192.168.2.185:44816)
2025-08-07T07:47:30.265125134Z  9(52) INFO: <script>: Current Contact 
header: <sip:[email protected];transport=ws;ob>
2025-08-07T07:47:30.265135557Z  9(52) INFO: <script>: Setting new 
Contact header: 
<sip:[email protected];transport=ws;ob;alias=192.168.2.185~44816~6;alias=192.168.2.185~44816~6>
2025-08-07T07:47:30.265484502Z  9(52) INFO: <script>: MANAGE_BRANCH: New 
branch [0] to sip:**[email protected]
2025-08-07T07:47:30.265664116Z  9(52) INFO: <script>: NATMANAGE 
branch_id:0 ruri: sip:**[email protected], method:INVITE, status:<null>, 
extra_id: z9hG4bK16860370, rtpengine_manage: replace-origin 
replace-session-connection via-branch=extra rtcp-mux-demux SDES-off 
ICE=remove RTP/AVP
2025-08-07T07:47:30.265819591Z INFO: [412n0o8dedgair81t70p]: [control] 
Received command 'offer' from 127.0.0.1:50790
2025-08-07T07:47:30.265979425Z NOTICE: [412n0o8dedgair81t70p]: [core] 
Creating new call
2025-08-07T07:47:30.267497852Z INFO: [412n0o8dedgair81t70p]: [control] 
Replying to 'offer' from 127.0.0.1:50790 (elapsed time 0.001599 sec)
2025-08-07T07:47:30.469565385Z  9(52) INFO: <script>: START: CANCEL from 
sip:**[email protected] (IP:192.168.2.185:44816)
2025-08-07T07:47:30.469629711Z  9(52) INFO: <script>: Current Contact 
header: <null>
2025-08-07T07:47:30.469645116Z  9(52) INFO: <script>: Setting new 
Contact header: <null>
2025-08-07T07:47:41.207672567Z  7(50) INFO: <script>: WebSocket 
connection from 192.168.2.185:44816 has closed
2025-08-07T07:47:57.917754216Z  2(45) WARNING: tm 
[../../core/forward.h:203]: msg_send_buffer(): TCP/TLS connection for 
WebSocket could not be found
2025-08-07T07:48:00.230412646Z  2(45) INFO: <script>: BRANCH FAILED: 
z9hG4bK1686037 + 0INFO: [412n0o8dedgair81t70p]: [control] Received 
command 'delete' from 127.0.0.1:36296
2025-08-07T07:48:00.230457143Z INFO: [412n0o8dedgair81t70p]: [core] 
Deleting call branch '' (via-branch 'z9hG4bK16860370')
2025-08-07T07:48:00.230466718Z INFO: [412n0o8dedgair81t70p]: [core] Call 
branch '' (via-branch 'z9hG4bK16860370') deleted, no more branches remaining
2025-08-07T07:48:00.230475640Z INFO: [412n0o8dedgair81t70p]: [core] 
Deleting entire call
2025-08-07T07:48:00.230483968Z INFO: [412n0o8dedgair81t70p]: [core] 
Final packet stats:
2025-08-07T07:48:00.230491909Z INFO: [412n0o8dedgair81t70p]: [core] --- 
Tag 'hc7h5imu96', created 0:30 ago for branch ''
2025-08-07T07:48:00.230518917Z INFO: [412n0o8dedgair81t70p]: [core] 
---     subscribed to ''
2025-08-07T07:48:00.230528302Z INFO: [412n0o8dedgair81t70p]: [core] 
---     subscription for ''
2025-08-07T07:48:00.230537387Z INFO: [412n0o8dedgair81t70p]: [core] 
------ Media #1 (audio over UDP/TLS/RTP/SAVPF) using unknown codec
2025-08-07T07:48:00.230545867Z INFO: [412n0o8dedgair81t70p]: [core] 
--------- Port   192.168.2.209:23400 <> 192.168.2.185:46431, SSRC 0, 0 
p, 0 b, 0 e, 30 ts
2025-08-07T07:48:00.230554949Z INFO: [412n0o8dedgair81t70p]: [core] --- 
Tag '', created 0:30 ago for branch 'z9hG4bK16860370'
2025-08-07T07:48:00.230563124Z INFO: [412n0o8dedgair81t70p]: [core] 
---     subscribed to 'hc7h5imu96'
2025-08-07T07:48:00.230570851Z INFO: [412n0o8dedgair81t70p]: [core] 
---     subscription for 'hc7h5imu96'
2025-08-07T07:48:00.230578827Z INFO: [412n0o8dedgair81t70p]: [core] 
------ Media #1 (audio over RTP/AVP) using unknown codec
2025-08-07T07:48:00.230587091Z INFO: [412n0o8dedgair81t70p]: [core] 
--------- Port   192.168.2.209:23494 <>                :0    , SSRC 0, 0 
p, 0 b, 0 e, 30 ts
2025-08-07T07:48:00.230595631Z INFO: [412n0o8dedgair81t70p]: [core] 
--------- Port   192.168.2.209:23495 <>                :0     (RTCP), 
SSRC 0, 0 p, 0 b, 0 e, 30 ts
2025-08-07T07:48:00.230603868Z INFO: [412n0o8dedgair81t70p]: [control] 
Replying to 'delete' from 127.0.0.1:36296 (elapsed time 0.000253 sec)
*2025-08-07T07:48:00.230753116Z  2(45) INFO: <script>: Failure: <null> 
2(45) WARNING: tm [../../core/forward.h:203]: msg_send_buffer(): TCP/TLS 
connection for WebSocket could not be found*

---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

especially the bold lines  confuse me. Why is the TCP/TLS closed and can 
not be found ? Could that be the problem ?*
*

*
*

Thanks for some help and best regards

Peter*
*

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