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### Description
<!--
Explain what you did, what you expected to happen, and what actually happened.
I made a test ：Several volte mobile accessed into eNB, some of them made call
and hung up periodically .
After some time, ims registrations all failed. I found pcscf error log below
periodically when try to ims register :
2024-05-28T13:32:30.952258+08:00 spid-YL-CLU6L-V1 pcscf[13401]: ERROR: {1
750211591 REGISTER 750211591_1277609064@172.60.5.12} cdp [routing.c:296]:
get_routing_peer(): get_routing_peer(): No connected DefaultRoute peer found
for app_id 16777236 and vendor id 10415.
2024-05-28T13:32:30.952346+08:00 spid-YL-CLU6L-V1 pcscf[13401]: ERROR: {1
750211591 REGISTER 750211591_1277609064@172.60.5.12} cdp [diameter_comm.c:144]:
AAASendMessage(): AAASendMessage(): Can't find a suitable connected peer in the
routing table.
And the RX reconnection appeared periodically ,which could be found in packet
capture:
2024-05-28T13:32:49.595500+08:00 spid-YL-CLU6L-V1 pcscf[13372]: INFO: cdp
[receiver.c:1006]: peer_connect(): peer_connect(): Trying to connect to
127.0.0.9 port 3868
2024-05-28T13:32:49.595621+08:00 spid-YL-CLU6L-V1 pcscf[13372]: INFO: cdp
[receiver.c:1106]: peer_connect(): peer_connect(): Peer
pcrf.epc.mnc009.mcc460.3gppnetwork.org:3868 connected
PCRF error log periodically :
[diam] ERROR: pid:PSM/pcscf.ims.mnc009.mcc460.3gppnetwork.org in
[fd_p_ce_handle_newCER@p_ce.c](mailto:fd_p_ce_handle_newCER@p_ce.c):1138:
pcscf.ims.mnc009.mcc460.3gppnetwork.org: Rejecting new connection attempt while
our state machine is in state 'STATE_SUSPECT'
-->
### Troubleshooting
#### Reproduction
<!--
If the issue can be reproduced, describe how it can be done.
Several volte mobile accessed into eNB, some of them made call and hung up
periodically .
After some time, ims registrations all failed.
-->
#### Debugging Data
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If you got a core dump, use gdb to extract troubleshooting data - full
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If you are familiar with gdb, feel free to attach more of what you consider to
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```
(paste your debugging data here)
```
#### Log Messages
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Check the syslog file and if there are relevant log messages printed by
Kamailio, add them next, or attach to issue, or provide a link to download them
(e.g., to a pastebin site).
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```
(paste your log messages here)
```
#### SIP Traffic
<!--
If the issue is exposed by processing specific SIP messages, grab them with
ngrep or save in a pcap file, then add them next, or attach to issue, or
provide a link to download them (e.g., to a pastebin site).
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```
(paste your sip traffic here)
```
### Possible Solutions
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If you found a solution or workaround for the issue, describe it. Ideally,
provide a pull request with a fix.
-->
If I restarted pcscf, ims registration worked well.After some time ,the error
occurred again.
### Additional Information
* **Kamailio Version** - output of `kamailio -v`
```
(paste your output here)
```
kamailio v5.6.0
* **Operating System**:
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-->
ubuntu server 18.04
```
(paste your output here)
```
[Uploading ims-reg-fail (1).zip…]()
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