Hello Sylvain,
Here it is debug log from phone, hope it will help.
Currently I am not back home and do not have remote access to PBX.
Initializing LinphoneCore unknown[LinphoneManager] Global state changed: GlobalStartup, message=Starting upassigning PCMU/8000 payload type number 0assigning GSM/8000 payload type number 3assigning PCMA/8000 payload type number 8assigning speex/8000 payload type number 110assigning speex/16000 payload type number 111assigning speex/32000 payload type number 112assigning telephone-event/8000 payload type number 101assigning G722/8000 payload type number 9assigning H263/90000 payload type number 34assigning theora/90000 payload type number 97assigning H263-1998/90000 payload type number 98assigning MP4V-ES/90000 payload type number 99assigning H264/90000 payload type number 102assigning VP8/90000 payload type number 103assigning x-snow/90000 payload type number 96assigning iLBC/8000 payload type number 100assigning AMR/8000 payload type number 104assigning AMR-WB/16000 payload type number 105assigning 1015/8000 payload type number 106assigning G726-16/8000 payload type number 107assigning G726-24/8000 payload type number 108assigning G726-32/8000 payload type number 109assigning G726-40/8000 payload type number 113assigning AAL2-G726-16/8000 payload type number 114assigning AAL2-G726-24/8000 payload type number 115assigning AAL2-G726-32/8000 payload type number 116assigning AAL2-G726-40/8000 payload type number 117assigning SILK/8000 payload type number 118assigning SILK/12000 payload type number 119assigning SILK/16000 payload type number 120assigning SILK/24000 payload type number 121assigning G729/8000 payload type number 18assigning mpeg4-generic/22050 payload type number 122assigning mpeg4-generic/44100 payload type number 123assigning opus/48000 payload type number 124assigning 1016/8000 payload type number 1assigning GSM/8000 payload type number 3assigning G723/8000 payload type number 4assigning LPC/8000 payload type number 7assigning PCMA/8000 payload type number 8assigning G722/8000 payload type number 9assigning L16/44100 payload type number 10assigning L16/44100 payload type number 11assigning G729/8000 payload type number 18assigning H261/90000 payload type number 31assigning MPV/90000 payload type number 32assigning H263/90000 payload type number 34Mediastreamer2 unknown (git: unknown) starting.ms_base_init() doneRegistering all soundcard handlersRegistering all webcam handlersms_voip_init() doneLoading ms plugins from [.]libmsamr wp plugin loadedPlugin loaded (.\libmsamr.dll)Plugin loaded (.\libmsilbc.dll) libmssilk debug plugin loadedPlugin loaded (.\libmssilk.dll)Card 'MSWASAPISndCard: WASAPI sound card' addedlibmswasapi plugin loadedPlugin loaded (.\libmswasapi.dll)Webcam MSWP8Cap: Back addedWebcam MSWP8Cap: Front addedlibmswp8vid plugin loadedPlugin loaded (.\libmswp8vid.dll)Sal nat helper [enabled]no plugin (*.dll) found in \libms*.dll../Assets/Sounds/rings/oldphone.wav does not existlinphone_core_set_playback_gain_db(): no active call.linphone_core_set_mic_gain_db(): no active call.MTU is supposed to be 1300, rtp payload max size will be 1240Sal nat helper [enabled]Sal use rport [enabled]Could not find encoder for 1016Could not find decoder for 1016Could not find encoder for G723Could not find decoder for G723Could not find encoder for LPCCould not find decoder for LPCCould not find encoder for G729Could not find decoder for G729Could not find encoder for telephone-eventCould not find decoder for telephone-eventCould not find encoder for 1015Could not find decoder for 1015Could not find encoder for G726-16Could not find decoder for G726-16Could not find encoder for G726-24Could not find decoder for G726-24Could not find encoder for G726-32Could not find decoder for G726-32Could not find encoder for G726-40Could not find decoder for G726-40Could not find encoder for AAL2-G726-16Could not find decoder for AAL2-G726-16Could not find encoder for AAL2-G726-24Could not find decoder for AAL2-G726-24Could not find encoder for AAL2-G726-32Could not find decoder for AAL2-G726-32Could not find encoder for AAL2-G726-40Could not find decoder for AAL2-G726-40Could not find encoder for mpeg4-genericCould not find decoder for mpeg4-genericCould not find encoder for mpeg4-genericCould not find decoder for mpeg4-genericCould not find encoder for opusCould not find decoder for opusCould not find encoder for H261Could not find decoder for H261Could not find encoder for MPVCould not find decoder for MPVCould not find encoder for H263Could not find decoder for H263Could not find encoder for x-snowCould not find decoder for x-snowCould not find encoder for theoraCould not find decoder for theoraCould not find encoder for H263-1998Could not find decoder for H263-1998Could not find encoder for MP4V-ESCould not find decoder for MP4V-ESCould not find encoder for VP8Could not find decoder for VP8Sal use rport [enabled]sal_unlisten_ports doneCreating listening point [02B19FD8] on [sip:0.0.0.0:5060;transport=UDP]belle_sip_socket_set_dscp(): not implemented.we are using a specific display:MSWP8DisTurning tunnel [off][LinphoneManager] Global state changed: GlobalOn, message=Ready[LinphoneManager] AudioEndpointChanged:Speakerphone[LinphoneManager] AudioEndpointChanged:SpeakerphoneNetwork state is now [UP]belle_sip_client_transaction_send_request(): waiting channel to be readychannel 02B280A0: state RES_IN_PROGRESStransaction [005A7DE0] channel state changed to [RES_IN_PROGRESS]Neither Expires header nor corresponding Contact header found, checking from original requestRefresher [02B43B40] takes ownership of transaction [005A7DE0]Proxy config [005A8380] for identity ["Goran" <sip:address@hidden>] moving from state [LinphoneRegistrationNone] to [LinphoneRegistrationProgress][LinphoneManager] Registration state changed: RegistrationInProgress, message=Registration in progress for identity "Goran" <sip:address@hidden>sip.domain.com resolved to Public_IP_Address_Of_Serverchannel 02B280A0: state RES_DONEtransaction [005A7DE0] channel state changed to [RES_DONE]channel 02B280A0: state CONNECTINGtransaction [005A7DE0] channel state changed to [CONNECTING]Trying to connect to [UDP://Public_IP_Address_Of_Server:5060]Channel has local address 192.168.100.133:5060channel 02B280A0: state READYtransaction [005A7DE0] channel state changed to [READY]Changing [client] [REGISTER] transaction [005A7DE0], from state [INIT] to [TRYING]channel [02B280A0]: message sent to [UDP://sip.domain.com:5060], size: [576] bytesREGISTER sip:sip.domain.com SIP/2.0
Via: SIP/2.0/UDP 192.168.100.133:5060;branch=z9hG4bK.dl1vqTdpz;rport
From: "Goran" <sip:address@hidden>;tag=kqBqkul7F
To: "Goran" <sip:address@hidden>
CSeq: 20 REGISTER
Call-ID: 0HVz6OJsF6
Max-Forwards: 70
Contact: <sip:address@hidden;app-id=db3.notify.live.net;pn-type=wp;pn-tok=/throttledthirdparty/01.00/AQEgEQ9bSgz3TanUB38DOjSqAgAAAAADEwAAAAQUZm52OkJCMjg1QTg1QkZDMkUxREQFBkVVV0UwMQ>;+sip.instance="<urn:uuid:6bcd70ba-a332-4128-bcea-fba61d4c3c2a>"
Expires: 3600
User-Agent: LinphoneWP8/1.0.1.0 (belle-sip/1.2.1)
channel [02B280A0]: received [507] new bytes from [sip.domain.com:5060]:SIP/2.0 401 Unauthorized
Via: SIP/2.0/UDP 192.168.100.133;branch=z9hG4bK.dl1vqTdpz;received=192.168.100.133;rport=5060
From: "Goran" <sip:address@hidden>;tag=kqBqkul7F
To: "Goran" <sip:address@hidden>;tag=as7155e3a6
Call-ID: 0HVz6OJsF6
CSeq: 20 REGISTER
Server: FPBX-2.10.1(1.8.16.0)
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY, INFO, PUBLISH
Supported: replaces, timer
WWW-Authenticate: Digest algorithm=MD5, realm="asterisk", nonce="5b53a9a8"
Content-Length: 0
channel [02B280A0] read message of [507] bytes:SIP/2.0 401 Unauthorized
Via: SIP/2.0/U...channel [02B280A0] [507] bytes parsedchannel [02B280A0]: discovered public ip and port are [192.168.100.133:5060]Found transaction matching response.Changing [client] [REGISTER] transaction [005A7DE0], from state [TRYING] to [COMPLETED][LinphoneManager] Auth info requested: realm=asterisk, username=usernameNo auth info found for call id [0HVz6OJsF6]Auth info not found for this refresh operation on [02B43B40]Register refresher [401] reason [Unauthorized] for proxy [sip:sip.domain.com]Proxy config [005A8380] for identity ["Goran" <sip:address@hidden>] moving from state [LinphoneRegistrationProgress] to [LinphoneRegistrationFailed][LinphoneManager] Registration state changed: RegistrationFailed, message=Unauthorized for identity "Goran" <sip:address@hidden>