Error Response msg 200/INVITE: Broken pipe

Hi community,

we have a VM with Debian 10 running Asterisk 16.2.1. Hypervisor is a Windows Server 2019. Driver is PJSIP.
The pbx is running great, but there is a single error, which repeats from time to time:

[Mar  1 10:58:41] WARNING[840] pjproject:            tsx0x7fe08c0741e8 .Error sending Response msg 200/INVITE/cseq=21884669 (tdta0x7fe12c0af3e8): Broken pipe
[Mar  1 10:58:47] WARNING[840] pjproject:            tsx0x7fe08c0741e8 .Error sending Response msg 200/INVITE/cseq=21884669 (tdta0x7fe12c0af3e8): Broken pipe
[Mar  1 10:58:47] WARNING[840] pjproject:            tsx0x7fe08c0741e8 .Transport error, terminating transaction. Err=120032 (Broken pipe)

(cseq / tdta / tsx vary)

I cannot reproduce the error. The error occured 8 times the last 4 weeks.
It is always a incoming call (Telekom SIP-Trunk, Germany). The error message is logged after the Dial(). If the endpoint is not_inuse and answers the call, the line seems dead. But the error also occured on busy endpoints.

Could you give me a tip, where i should start the search for the root cause? Telephones (Snom D385, Gigaset N510 Pro), cable-infractructure, hypervisor, config?

If you need any further information, just hit me up.
Thanks in advance!

What connectivity is in use to the provider? Is it TCP or TLS? Is the connection getting dropped?

We’re using TCP. As far as i can see, the call is getting dropped, but the registration not.

Sometimes, not always, there is also a warning “task processor queue reached 500 scheduled tasks again.” some seconds before:

[Feb  8 12:53:46] WARNING[23116] pjproject:          tsx0x7f57d01f7948 .Error sending Response msg 200/INVITE/cseq=69747808 (tdta0x7f57ac017cb8): Broken pipe
[Feb  8 12:53:52] WARNING[23116] pjproject:          tsx0x7f57d01f7948 .Error sending Response msg 200/INVITE/cseq=69747808 (tdta0x7f57ac017cb8): Broken pipe
[Feb  8 12:53:52] WARNING[23116] pjproject:          tsx0x7f57d01f7948 .Transport error, terminating transaction. Err=120032 (Broken pipe)
[Feb  9 17:33:11] WARNING[23116] pjproject:          tsx0x7f57ac22f358 .Error sending Response msg 200/INVITE/cseq=67173382 (tdta0x7f57d81ebeb8): Broken pipe
[Feb  9 17:33:17] WARNING[23116] pjproject:          tsx0x7f57ac22f358 .Error sending Response msg 200/INVITE/cseq=67173382 (tdta0x7f57d81ebeb8): Broken pipe
[Feb  9 17:33:17] WARNING[23116] pjproject:          tsx0x7f57ac22f358 .Transport error, terminating transaction. Err=120032 (Broken pipe)
[Feb 10 17:29:45] WARNING[23116] pjproject:          tsx0x7f57b42361f8 .Error sending Response msg 200/INVITE/cseq=73874457 (tdta0x7f579422c978): Broken pipe
[Feb 10 17:29:51] WARNING[23116] pjproject:          tsx0x7f57b42361f8 .Error sending Response msg 200/INVITE/cseq=73874457 (tdta0x7f579422c978): Broken pipe
[Feb 10 17:29:51] WARNING[23116] pjproject:          tsx0x7f57b42361f8 .Transport error, terminating transaction. Err=120032 (Broken pipe)
[Feb 10 17:31:58] WARNING[23116] pjproject:          tsx0x7f57e00a5f98 .Error sending Response msg 200/INVITE/cseq=80642936 (tdta0x7f57c8256788): Broken pipe
[Feb 10 17:32:04] WARNING[23116] pjproject:          tsx0x7f57e00a5f98 .Error sending Response msg 200/INVITE/cseq=80642936 (tdta0x7f57c8256788): Broken pipe
[Feb 10 17:32:04] WARNING[23116] pjproject:          tsx0x7f57e00a5f98 .Transport error, terminating transaction. Err=120032 (Broken pipe)
[Feb 11 15:46:48] WARNING[23116] pjproject:          tsx0x7f58201a7ef8 .Error sending Response msg 200/INVITE/cseq=1864177 (tdta0x7f584c4631d8): Broken pipe
[Feb 11 15:46:54] WARNING[23116] pjproject:          tsx0x7f58201a7ef8 .Error sending Response msg 200/INVITE/cseq=1864177 (tdta0x7f584c4631d8): Broken pipe
[Feb 11 15:46:54] WARNING[23116] pjproject:          tsx0x7f58201a7ef8 .Transport error, terminating transaction. Err=120032 (Broken pipe)
[Feb 24 17:51:15] WARNING[840] pjproject:            tsx0x7fe0a002bb08 .Error sending Response msg 200/INVITE/cseq=18882213 (tdta0x7fe05c0307b8): Broken pipe
[Feb 24 17:51:21] WARNING[840] pjproject:            tsx0x7fe0a002bb08 .Error sending Response msg 200/INVITE/cseq=18882213 (tdta0x7fe05c0307b8): Broken pipe
[Feb 24 17:51:21] WARNING[840] pjproject:            tsx0x7fe0a002bb08 .Transport error, terminating transaction. Err=120032 (Broken pipe)
[Mar  1 10:58:41] WARNING[840] pjproject:            tsx0x7fe08c0741e8 .Error sending Response msg 200/INVITE/cseq=21884669 (tdta0x7fe12c0af3e8): Broken pipe
[Mar  1 10:58:47] WARNING[840] pjproject:            tsx0x7fe08c0741e8 .Error sending Response msg 200/INVITE/cseq=21884669 (tdta0x7fe12c0af3e8): Broken pipe
[Mar  1 10:58:47] WARNING[840] pjproject:            tsx0x7fe08c0741e8 .Transport error, terminating transaction. Err=120032 (Broken pipe)
[Mar  1 12:45:43] WARNING[840] pjproject:            tsx0x7fe09805def8 .Error sending Response msg 200/INVITE/cseq=37050878 (tdta0x7fe060012878): Broken pipe
[Mar  1 12:45:49] WARNING[840] pjproject:            tsx0x7fe09805def8 .Error sending Response msg 200/INVITE/cseq=37050878 (tdta0x7fe060012878): Broken pipe
[Mar  1 12:45:49] WARNING[840] pjproject:            tsx0x7fe09805def8 .Transport error, terminating transaction. Err=120032 (Broken pipe)
[Mar  3 11:20:30] WARNING[840] pjproject:            tsx0x7fe098078698 .Error sending Response msg 200/INVITE/cseq=38999340 (tdta0x7fe0a0027ab8): Broken pipe
[Mar  3 11:20:36] WARNING[840] pjproject:            tsx0x7fe098078698 .Error sending Response msg 200/INVITE/cseq=38999340 (tdta0x7fe0a0027ab8): Broken pipe
[Mar  3 11:20:36] WARNING[840] pjproject:            tsx0x7fe098078698 .Transport error, terminating transaction. Err=120032 (Broken pipe)
[Mar  5 09:48:53] WARNING[840] pjproject:            tsx0x7fe08c007198 .Error sending Response msg 200/INVITE/cseq=30888112 (tdta0x7fe05803f278): Broken pipe
[Mar  5 09:48:59] WARNING[840] pjproject:            tsx0x7fe08c007198 .Error sending Response msg 200/INVITE/cseq=30888112 (tdta0x7fe05803f278): Broken pipe
[Mar  5 09:48:59] WARNING[840] pjproject:            tsx0x7fe08c007198 .Transport error, terminating transaction. Err=120032 (Broken pipe)
[Feb  8 12:53:44] WARNING[23116] taskprocessor.c: The 'pjsip/outreg/telekom_meine-rufnummer-0000009f' task processor queue reached 500 scheduled tasks.
[Feb 22 09:25:37] WARNING[840] taskprocessor.c: The 'pjsip/outreg/telekom_meine-rufnummer-0000009f' task processor queue reached 500 scheduled tasks.
[Feb 24 17:51:13] WARNING[840] taskprocessor.c: The 'pjsip/outreg/telekom_meine-rufnummer-0000009f' task processor queue reached 500 scheduled tasks again.
[Mar  1 10:58:40] WARNING[840] taskprocessor.c: The 'pjsip/outreg/telekom_meine-rufnummer-0000009f' task processor queue reached 500 scheduled tasks again.
[Mar  3 11:20:29] WARNING[840] taskprocessor.c: The 'pjsip/outreg/telekom_meine-rufnummer-0000009f' task processor queue reached 500 scheduled tasks again.
[Mar  5 09:48:51] WARNING[840] taskprocessor.c: The 'pjsip/outreg/telekom_meine-rufnummer-0000009f' task processor queue reached 500 scheduled tasks again.

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