Dropped calls - restrictedroute shown in CRD report

Hi community,
I am a totally newbie to pbbx systems.
I am using Sangoma PBX (3.0.197.2)
Since some weeks several users complain that calls are dropped after diffetent time - sometimes after a few seconds, sometimes after 30 minutes.
When I check CDR I see “restrictedroute”.
Wehn the calls are dropped I am no more reachable from outside and also calls to outside are not working. After a time (up to 2 minutes) the lines are back online again and calls go through but randomly dropped later again.
Does anyone has an idea how to fix this?
thx

You need to provide a full SIP trace of a failing call. Otherwise one can only guess. It could be network, hardware, NAT problems and/or a problem with the configuration of session timers. Maybe it is something else…

Do you speak about this log? If not, can you tell me how to get the SIP trace?
Call Event Log - Search Returned 13 Events

Time Event CNAM CNUM ANI DID AMA exten context App channel UserDefType EventExtra CEL Table
2022-06-15 10:46:38 CHAN_START Extension 33 33 DEFAULT 052123xxxx from-internal SIP/33-000046d3
2022-06-15 10:46:39 CHAN_START DEFAULT s from-pstn-toheader SIP/WIZ_T-69499-000046d4
2022-06-15 10:46:41 ANSWER CID:+49522169xxxxx 052123xxxx DEFAULT 052123xxxx from-pstn-toheader AppDial SIP/WIZ_T-69499-000046d4
2022-06-15 10:46:41 ANSWER +49522169xxxxx 33 052123xxxx DEFAULT s macro-dialout-trunk Dial SIP/33-000046d3
2022-06-15 10:46:41 BRIDGE_ENTER CID:+49522169xxxxx 052123xxxx DEFAULT s macro-dialout-trunk AppDial SIP/WIZ_T-69499-000046d4
2022-06-15 10:46:41 BRIDGE_ENTER +49522169xxxxx 33 052123xxxx DEFAULT s macro-dialout-trunk Dial SIP/33-000046d3
2022-06-15 10:49:20 BRIDGE_EXIT +49522169xxxxx 33 052123xxxx DEFAULT s macro-dialout-trunk Dial SIP/33-000046d3
2022-06-15 10:49:20 BRIDGE_EXIT CID:+49522169xxxxx 052123xxxx DEFAULT s macro-dialout-trunk AppDial SIP/WIZ_T-69499-000046d4
2022-06-15 10:49:20 HANGUP CID:+49522169xxxxx 052123xxxx DEFAULT s macro-dialout-trunk AppDial SIP/WIZ_T-69499-000046d4
2022-06-15 10:49:20 CHAN_END CID:+49522169xxxxx 052123xxxx DEFAULT s macro-dialout-trunk AppDial SIP/WIZ_T-69499-000046d4
2022-06-15 10:49:20 HANGUP +49522169xxxxx 33 052123xxxx DEFAULT h restrictedroute-c4ca4238a0b923820dcc509a6f75849b SIP/33-000046d3
2022-06-15 10:49:20 CHAN_END +49522169xxxxx 33 052123xxxx DEFAULT h restrictedroute-c4ca4238a0b923820dcc509a6f75849b SIP/33-000046d3
2022-06-15 10:49:20 LINKEDID_END +49522169xxxxx 33 052123xxxx DEFAULT h restrictedroute-c4ca4238a0b923820dcc509a6f75849b SIP/33-000046d3
Related Call Detail Records

Call Date Recording System CallerID Outbound CallerID DID App Destination Disposition Duration Userfield Account CDR Table CDR Graph
2022-06-15 10:46:38 1655282798.20127 “Extension 33” <33> <+49522169xxxxx> Dial 052123xxxx ANSWERED 02:41

No, I meant the output of “pjsip set logger on”.