Lost endpoint authorization?

I have FreePBX 15.0.16.64 up and running for some time now. Now there is an issue that incoming calls stop working after few days. Restarting asterisk does solve this issue.
Today I had the problem again and I took some logs (see below).

My question is if there are any clue why the server does no longer find the endpoint of the call.
I use FreePBX 15.0.16.64

TIA,

HS

=========== Call OK START LOG ===========
<— Received SIP request (1779 bytes) from TCP:217.0.129.229:5060 —>
INVITE sip:[email protected]:5060;transport=TCP SIP/2.0
Via: SIP/2.0/TCP 217.0.129.229:5060;branch=z9hG4bK6601c10a57634cea63130a9d5221acf3.8cde679e
Record-Route: sip:reg.sip-trunk.telekom.de;transport=tcp;lr
Max-Forwards: 60
To: sip:[email protected];user=phone
From: sip:[email protected];user=phone;tag=217a3e7e
Call-ID: [email protected]
Contact: sip:MCdAAnulOXmVoIfwYJH98yBoRh6Vz5tJ7606BqvZ5sHQDlAMOVl+/KqbuehXmQQpSl1q@th1
Supported: 100rel,histinfo,path,timer
Session-Expires: 1920
CSeq: 13060035 INVITE
Allow: ACK, BYE, CANCEL, INFO, INVITE, MESSAGE, NOTIFY, OPTIONS, PRACK, REFER, REGISTER, UPDATE
Min-SE: 900
P-Asserted-Identity: sip:[email protected];user=phone
P-Called-Party-ID: sip:[email protected];user=phone
Accept-Contact: *;+g.3gpp.icsi-ref=“urn%3Aurn-7%3A3gpp-service.ims.icsi.mmtel”
Session-ID: edcf243a7819ea59ad9299c249cf7281
Content-Type: application/sdp
Content-Disposition: session
Content-Length: 736

[2020-07-13 13:30:52] DEBUG[11988]: res_pjsip/pjsip_distributor.c:384 find_dialog: Could not find matching transaction for Request msg INVITE/cseq=13060035 (rdata0x7f39680be288)
[2020-07-13 13:30:52] DEBUG[11988]: res_pjsip/pjsip_distributor.c:462 ast_sip_get_distributor_serializer: Calculated serializer pjsip/distributor-0000003b to use for Request msg INVITE/cseq=13060035 (rdata0x7f39680be288)
[2020-07-13 13:30:52] DEBUG[28270]: res_pjsip_endpoint_identifier_ip.c:255 ip_identify_match_check: Source address 217.0.129.229:5060 matches identify ‘0000000000’
[2020-07-13 13:30:52] DEBUG[28270]: res_pjsip_endpoint_identifier_ip.c:288 common_identify: Identify ‘0000000000’ SIP message matched to endpoint 0000000000

=========== Call OK END LOG ===========

=========== Call FAILURE START LOG ===========
<— Received SIP request (1777 bytes) from TCP:217.0.129.229:5060 —>
INVITE sip:[email protected]:5060;transport=TCP SIP/2.0
Via: SIP/2.0/TCP 217.0.129.229:5060;branch=z9hG4bK988bb2de1d5d39176b0e972d75f67bc3.4681a247
Record-Route: sip:reg.sip-trunk.telekom.de;transport=tcp;lr
Max-Forwards: 60
To: sip:[email protected];user=phone
From: sip:[email protected];user=phone;tag=755d8888
Call-ID: [email protected]
Contact: sip:0yV6etxakrWLhFx1fFO6RhagbRzos6NOzghiMV56IOSrOicFBhFVs2fKCSMdCOqKkwNW@th1
Supported: 100rel,histinfo,path,timer
Session-Expires: 1920
CSeq: 3563873 INVITE
Allow: ACK, BYE, CANCEL, INFO, INVITE, MESSAGE, NOTIFY, OPTIONS, PRACK, REFER, REGISTER, UPDATE
Min-SE: 900
P-Asserted-Identity: sip:[email protected];user=phone
P-Called-Party-ID: sip:[email protected];user=phone
Accept-Contact: *;+g.3gpp.icsi-ref=“urn%3Aurn-7%3A3gpp-service.ims.icsi.mmtel”
Session-ID: b97733bd0be2fbab710df78c04a10054
Content-Type: application/sdp
Content-Disposition: session
Content-Length: 735

[2020-07-13 13:12:40] DEBUG[11988]: res_pjsip/pjsip_distributor.c:384 find_dialog: Could not find matching transaction for Request msg INVITE/cseq=3563873 (rdata0x7f39680be288)
[2020-07-13 13:12:40] DEBUG[11988]: res_pjsip/pjsip_distributor.c:462 ast_sip_get_distributor_serializer: Calculated serializer pjsip/distributor-00000047 to use for Request msg INVITE/cseq=3563873 (rdata0x7f39680be288)
[2020-07-13 13:12:40] DEBUG[100150]: res_pjsip_endpoint_identifier_ip.c:260 ip_identify_match_check: Source address 217.0.129.229:5060 does not match identify ‘0000000000’
[2020-07-13 13:12:40] DEBUG[100150]: res_pjsip_endpoint_identifier_user.c:148 username_identify: Attempting identify by From username ‘+1111111111111’ domain ‘sip-trunk.telekom.de
[2020-07-13 13:12:40] DEBUG[100150]: res_pjsip_endpoint_identifier_user.c:152 username_identify: Endpoint not found for From username ‘+1111111111111’ domain ‘sip-trunk.telekom.de
<— Transmitting SIP response (655 bytes) to TCP:217.0.129.229:5060 —>
SIP/2.0 401 Unauthorized

=========== Call FAILURE END LOG ===========

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