anfedoro created an issue (kamailio/kamailio#4344)
Hello please advice what is wrong
The scenario is following
Client get registred with p-cscf using udp as transport and ipsec enabled
Registration completed successfully.
Client send reg event SUBSCRIBE, and get 200 back
But it do not get any notification then.
In p-cscf container I am observing NOTIFY coming from s-cscf and then something
strange happen
```
52(95) NOTICE: {1 350779919 NOTIFY 0ed4dd8c-89a5-42ac-80cb-690891a400f1}
<script>: PCSCF: NOTIFY sip:172.22.0.1:55822;transport=udp
(sip:9076543...@ims.mnc001.mcc001.3gppnetwork.org (172.22.0.20:6060) to
sip:9076543...@ims.mnc001.mcc001.3gppnetwork.org,
0ed4dd8c-89a5-42ac-80cb-690891a400f1)
52(95) NOTICE: {1 350779919 NOTIFY 0ed4dd8c-89a5-42ac-80cb-690891a400f1}
<script>: Within DLG
52(95) NOTICE: {1 350779919 NOTIFY 0ed4dd8c-89a5-42ac-80cb-690891a400f1}
<script>: Within loose route
52(95) NOTICE: {1 350779919 NOTIFY 0ed4dd8c-89a5-42ac-80cb-690891a400f1}
<script>: PCSCF MO_indialog:
Destination URI: <null>
Request URI: sip:172.22.0.1:55822;transport=udp
52(95) NOTICE: {1 350779919 NOTIFY 0ed4dd8c-89a5-42ac-80cb-690891a400f1}
<script>: Source IP and Port: (172.22.0.20:6060)
Route-URI: sip:mo@172.22.0.21:6101;lr=on;ftag=b7f568fe
52(95) NOTICE: {1 350779919 NOTIFY 0ed4dd8c-89a5-42ac-80cb-690891a400f1}
<script>: Received IP and Port: (172.22.0.21:6101)
52(95) NOTICE: {1 350779919 NOTIFY 0ed4dd8c-89a5-42ac-80cb-690891a400f1}
<script>: Next hop domain: (172.22.0.1)
52(95) NOTICE: {1 350779919 NOTIFY 0ed4dd8c-89a5-42ac-80cb-690891a400f1}
<script>: Contact header: <sip:scscf.ims.mnc001.mcc001.3gppnetwork.org:6060>
52(95) INFO: {1 350779919 NOTIFY 0ed4dd8c-89a5-42ac-80cb-690891a400f1}
ims_ipsec_pcscf [cmd.c:1187]: ipsec_forward(): new destination URI:
sip:172.22.0.1:55822
99(142) ERROR: <core> [core/tcp_main.c:4645]: handle_tcpconn_ev(): connect
172.22.0.1:55822 failed
```
as you may see, request states transport=udp,
**Request URI: sip:172.22.0.1:55822;transport=udp**
while p-cscf then trying to use tcp??
**99(142) ERROR: <core> [core/tcp_main.c:4645]: handle_tcpconn_ev(): connect
172.22.0.1:55822 failed**
what is wrong?
Using tcp as a transport initially works well and NOTIFY is coming to the
client.
thanks in advance
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