DTLS issue when using in desktop App.

[ingangi]

flutter: [2022-07-12 15:28:57.758] Level.error rtc_session.dart:2452 ::: emit "peerconnection:setremotedescriptionfailed" [error:Unable to RTCPeerConnection::setRemoteDescription: Error Failed to set remote answer sdp: Called with SDP without DTLS fingerprint.]

I'm getting this error, I'm using the dart sip_ua lib in Flutter, I want to create a desktop App on MacOS, which is like the App named "microsip" on the Windows. This App only makes audio calls just like phones, and the Server is a Freeswitch, microsip works fine with this the server, but my App raised this error after the server responsed 200, seems the server doesn't support DTLS.(server is not maintained by me, I can't change anything on it). I wanna ask, can I disable DTLS checking in my App code? If can, how do I do it? Thank you so much!

SIP/2.0 200 OK
Via: SIP/2.0/WS 504h4a3z7sk8.invalid;branch=z9hG4bK11247848500000000;received=10.100.144.238;rport=50214
From: "2461" <sip:[email protected]>;tag=570109n08y
To: <sip:[email protected]>;tag=Ft6g041cy818Q
Call-ID: n9gd5tifb0tbg90nhtxc
CSeq: 5843 INVITE
Contact: <sip:[email protected]:5060;transport=udp>
User-Agent: FreeSWITCH-mod_sofia/1.4.26+git~20191219T025647Z~958cb6f6e9~64bit
Allow: INVITE, ACK, BYE, CANCEL, OPTIONS, MESSAGE, INFO, UPDATE, REGISTER, REFER, NOTIFY
Require: timer
Supported: timer, path, replaces
Allow-Events: talk, hold, conference, refer
Session-Expires: 120;refresher=uac
Content-Type: application/sdp
Content-Disposition: session
Content-Length: 261
Remote-Party-ID: "Outbound Call" <sip:[email protected]>;party=calling;privacy=off;screen=no

v=0
o=MS 1657592459 1657592460 IN IP4 10.100.124.20
s=MS
c=IN IP4 10.100.124.20
t=0 0
m=audio 18482 RTP/AVP 0 126
a=rtpmap:0 PCMU/8000
a=rtpmap:126 telephone-event/8000
a=fmtp:126 0-15
a=ptime:20
a=rtcp-mux
a=rtcp:18482 IN IP4 10.100.124.20


ACK sip:[email protected]:5060;transport=udp SIP/2.0
Via: SIP/2.0/WS 504h4a3z7sk8.invalid;branch=z9hG4bK6238067540000000
Max-Forwards: 69
To: <sip:[email protected]>;tag=Ft6g041cy818Q
From: "2461" <sip:[email protected]>;tag=570109n08y
Call-ID: n9gd5tifb0tbg90nhtxc
CSeq: 5843 ACK
Allow: INVITE,ACK,CANCEL,BYE,UPDATE,MESSAGE,OPTIONS,REFER,INFO
Supported: outbound
User-Agent: v1.0.0
Content-Length: 0



BYE sip:[email protected]:5060;transport=udp SIP/2.0
Via: SIP/2.0/WS 504h4a3z7sk8.invalid;branch=z9hG4bK1901186472
Max-Forwards: 69
To: <sip:[email protected]>;tag=Ft6g041cy818Q
From: "2461" <sip:[email protected]>;tag=570109n08y
Call-ID: n9gd5tifb0tbg90nhtxc
CSeq: 5844 BYE
Reason: SIP ;cause=488; text="Not Acceptable Here"
Allow: INVITE,ACK,CANCEL,BYE,UPDATE,MESSAGE,OPTIONS,REFER,INFO
Supported: outbound
User-Agent: v1.0.0
Content-Length: 0

flutter: [2022-07-12 15:28:57.756] Level.debug rtc_session.dart:2966 ::: session failed
flutter: [2022-07-12 15:28:57.756] Level.debug rtc_session.dart:2969 ::: emit "_failed"
flutter: [2022-07-12 15:28:57.757] Level.debug rtc_session.dart:1483 ::: close()
flutter: [2022-07-12 15:28:57.757] Level.debug rtc_session.dart:2980 ::: emit "failed"
flutter: [2022-07-12 15:28:57.757] Level.debug sip_ua_helper.dart:214 ::: call failed with cause: Code: [488], Cause: Bad Media Description, Reason: Not Acceptable Here
flutter: [2022-07-12 15:28:57.758] Level.error rtc_session.dart:2452 ::: emit "peerconnection:setremotedescriptionfailed" [error:Unable to RTCPeerConnection::setRemoteDescription: Error Failed to set remote answer sdp: Called with SDP without DTLS fingerprint.]