Hello,
I am writing to signal this issue, which affects all the last linphone versions 
I've tested. The following releases have all the same behaviour:

  *   Linphone Android 3.2.7 - Core 3.11.1 - Belle-sip/1.6.1
  *   Linphone IOS 3.13.9 - Core 3.9.1
  *   Linphone Desktop 4.1.1 - Core 3.12.0
We are using our SIP proxy and our desktop softphone, which in this scenario is 
the transfer agent.
A (our softphone) is connected with B (linphone) and it wants to do an 
unattended transer to C (another Linphone). Sofphone A acts according to the 
RFC 5359. This is what happen:

  1.  A sends a reINVITE with audio inactive and puts B on hold
  2.  A sends a REFER to B
  3.  B then calls C, but the outgoing INVITE contains a wrong SDP without a 
valid audio media. C refuses the call.
It seems that Linphone is not able to build a valid SDP if this sequence 
occurs. Our softphone, as many others (ad es. SNOM), puts the other party 
on-hold before sending the REFER. I am aware this isn't the way Linphone 
handles the blind transfer, but could you please fix it or suggest a workaround?
Regards,
Dario Santomaso.

Phase 1)

INVITE sip:steven@192.168.1.38:1344;transport=TCP SIP/2.0

From: 
"dsantomaso"<sip:dsantom...@alceo.com>;tag=a292a60-2601a8c0-ea99-55013-443d0-6d2baaf4-443d0

To: "steven"<sip:ste...@alceo.com>;tag=N-F0yYl

Call-ID: a29f898-2601a8c0-ea99-55013-443d0-bb193f6-443d0

CSeq: 2 INVITE

Via: SIP/2.0/TCP 192.168.1.5:5060;branch=z9hG4bK-43894-107d05bd-7cec0085

Via: SIP/2.0/TCP 192.168.1.38:60057;branch=z9hG4bK-443da-10a90e82-5cf5732e

Max-Forwards: 69

Supported: gruu,join,replaces,timer,100rel

User-Agent: BCSBar 4.0.14.0

Allow-Events: hold,refer

Contact: 
<sip:GRUUYzdlMjc4NjNlNTRjNzQ4ZjY0ZTNiMmIyZWY5YjJkOWM=@alceo.com>;audio;video;text;application

Session-Expires: 3600;refresher=uac

Allow: INVITE,ACK,CANCEL,BYE,NOTIFY,REFER,MESSAGE,INFO,SUBSCRIBE

Content-Type: application/sdp

Content-Length: 272



v=0

o=- 3716807545 3716807546 IN IP4 192.168.1.38

s=bcs

c=IN IP4 192.168.1.38

t=0 0

m=audio 52220 RTP/AVP 8 96

c=IN IP4 192.168.1.38

b=TIAS:96000

a=rtcp:52221 IN IP4 192.168.1.38

a=inactive

a=rtpmap:8 PCMA/8000

a=rtpmap:96 telephone-event/8000

a=fmtp:96 0-16


2017-10-12 14:32:35:964 MESSAGE channel [08CB2428] [808] bytes parsed
2017-10-12 14:32:35:964 MESSAGE channel [08CB2428] read [272] bytes of body 
from [server0f.ve.alceo.com:5060]
2017-10-12 14:32:35:965 MESSAGE Changing [server] [INVITE] transaction 
[0A6F8530], from state [INIT] to [PROCEEDING]
2017-10-12 14:32:35:965 MESSAGE channel [08CB2428]: message sent to 
[TCP://server0f.ve.alceo.com:5060], size: [414] bytes
SIP/2.0 100 Trying

Via: SIP/2.0/TCP 192.168.1.5:5060;branch=z9hG4bK-43894-107d05bd-7cec0085

Via: SIP/2.0/TCP 192.168.1.38:60057;branch=z9hG4bK-443da-10a90e82-5cf5732e

From: "dsantomaso" 
<sip:dsantom...@alceo.com>;tag=a292a60-2601a8c0-ea99-55013-443d0-6d2baaf4-443d0

To: "steven" <sip:ste...@alceo.com>;tag=N-F0yYl

Call-ID: a29f898-2601a8c0-ea99-55013-443d0-bb193f6-443d0

CSeq: 2 INVITE

Content-Length: 0




2017-10-12 14:32:35:965 MESSAGE Dialog [0AAAB390]: now updated by transaction 
[0A6F8530].
2017-10-12 14:32:35:966 MESSAGE Found payload PCMA/8000 fmtp=
2017-10-12 14:32:35:966 MESSAGE Found payload telephone-event/8000 fmtp=0-16
2017-10-12 14:32:35:966 MESSAGE audio stream index found: 0, updating main 
audio stream index
2017-10-12 14:32:35:966 MESSAGE Found media local-ip from signaling.
2017-10-12 14:32:35:966 MESSAGE Don't put video stream on local offer for call 
[089F8568]
2017-10-12 14:32:35:966 MESSAGE Don't put text stream on local offer for call 
[089F8568]
2017-10-12 14:32:35:966 MESSAGE Doing SDP offer/answer process of type incoming
2017-10-12 14:32:35:966 MESSAGE Found media local-ip from signaling.
2017-10-12 14:32:35:966 MESSAGE Don't put video stream on local offer for call 
[089F8568]
2017-10-12 14:32:35:966 MESSAGE Don't put text stream on local offer for call 
[089F8568]
2017-10-12 14:32:35:966 MESSAGE Accepting server transaction [0A6F8530] on op 
[0A8F8738]
2017-10-12 14:32:35:966 MESSAGE Doing SDP offer/answer process of type incoming
2017-10-12 14:32:35:966 MESSAGE channel [08CB2428]: message sent to 
[TCP://server0f.ve.alceo.com:5060], size: [889] bytes
SIP/2.0 200 Ok

Via: SIP/2.0/TCP 192.168.1.5:5060;branch=z9hG4bK-43894-107d05bd-7cec0085

Via: SIP/2.0/TCP 192.168.1.38:60057;branch=z9hG4bK-443da-10a90e82-5cf5732e

From: "dsantomaso" 
<sip:dsantom...@alceo.com>;tag=a292a60-2601a8c0-ea99-55013-443d0-6d2baaf4-443d0

To: "steven" <sip:ste...@alceo.com>;tag=N-F0yYl

Call-ID: a29f898-2601a8c0-ea99-55013-443d0-bb193f6-443d0

CSeq: 2 INVITE

User-Agent: Linphone Desktop/4.1.1 (belle-sip/1.6.3)

Supported: replaces, outbound

Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY, MESSAGE, SUBSCRIBE, 
INFO, UPDATE

Contact: 
<sip:steven@192.168.1.38:1344;transport=tcp>;+sip.instance="<urn:uuid:cc8309b7-5c2c-45e2-8f69-d4b94553b213>"

Content-Type: application/sdp

Content-Length: 151



v=0

o=steven 4085 3656 IN IP4 192.168.1.38

s=Talk

c=IN IP4 0.0.0.0

t=0 0

m=audio 7078 RTP/AVP 8 96

a=rtpmap:96 telephone-event/8000

a=inactive


2017-10-12 14:32:35:966 MESSAGE Changing [server] [INVITE] transaction 
[0A6F8530], from state [PROCEEDING] to [ACCEPTED]
2017-10-12 14:32:35:966 MESSAGE Dialog [0AAAB390]: now updated by transaction 
[0A6F8530].
2017-10-12 14:32:35:966 MESSAGE Other description has changed: CODEC_CHANGED 
2017-10-12 14:32:35:967 MESSAGE Media descriptions are different, need to 
restart the streams.
2017-10-12 14:32:35:967 MESSAGE Writing echo canceler state, 0 bytes
2017-10-12 14:32:35:967 WARNING .linphone.ecstate has not been created because 
there is no data to write
2017-10-12 14:32:35:967 MESSAGE ms_ticker_set_time_func: ticker's time method 
updated.
2017-10-12 14:32:35:976 MESSAGE Filter MSRtpRecv is not scheduled; nothing to 
do.
2017-10-12 14:32:35:976 MESSAGE 
===========================================================
2017-10-12 14:32:35:976 MESSAGE              AUDIO SESSION'S RTP STATISTICS     
           
2017-10-12 14:32:35:976 MESSAGE 
-----------------------------------------------------------
2017-10-12 14:32:35:976 MESSAGE sent                                        366 
packets
2017-10-12 14:32:35:976 MESSAGE                                               0 
duplicated packets
2017-10-12 14:32:35:976 MESSAGE                                           62952 
bytes  
2017-10-12 14:32:35:976 MESSAGE received                                    365 
packets
2017-10-12 14:32:35:976 MESSAGE                                               0 
duplicated packets
2017-10-12 14:32:35:976 MESSAGE                                           62780 
bytes  
2017-10-12 14:32:35:976 MESSAGE incoming delivered to the app             62436 
bytes  
2017-10-12 14:32:35:976 MESSAGE incoming cumulative lost                      0 
packets
2017-10-12 14:32:35:976 MESSAGE incoming received too late                    0 
packets
2017-10-12 14:32:35:976 MESSAGE incoming bad formatted                        0 
packets
2017-10-12 14:32:35:976 MESSAGE incoming discarded (queue overflow)           0 
packets
2017-10-12 14:32:35:976 MESSAGE sent rtcp                                     3 
packets
2017-10-12 14:32:35:976 MESSAGE received rtcp                                 3 
packets
2017-10-12 14:32:35:976 MESSAGE 
===========================================================
2017-10-12 14:32:35:976 MESSAGE ms_filter_unlink: 
MSWASAPIRead:0A2A76C8,0-->MSResample:0A2A84C8,0
2017-10-12 14:32:35:976 MESSAGE ms_filter_unlink: 
MSResample:0A2A84C8,0-->MSEqualizer:0A236560,0
2017-10-12 14:32:35:976 MESSAGE ms_filter_unlink: 
MSEqualizer:0A236560,0-->MSWebRTCAEC:08A55670,1
2017-10-12 14:32:35:976 MESSAGE ms_filter_unlink: 
MSWebRTCAEC:08A55670,1-->MSVolume:0A2A7D48,0
2017-10-12 14:32:35:976 MESSAGE ms_filter_unlink: 
MSVolume:0A2A7D48,0-->MSAudioMixer:0A2A8648,0
2017-10-12 14:32:35:976 MESSAGE ms_filter_unlink: 
MSAudioMixer:0A2A8648,0-->MSAlawEnc:0A2A8008,0
2017-10-12 14:32:35:976 MESSAGE ms_filter_unlink: 
MSAlawEnc:0A2A8008,0-->MSRtpSend:08A55430,0
2017-10-12 14:32:35:976 MESSAGE ms_filter_unlink: 
MSRtpRecv:08C5BC18,0-->MSAlawDec:0A2A8208,0
2017-10-12 14:32:35:976 MESSAGE ms_filter_unlink: 
MSAlawDec:0A2A8208,0-->MSGenericPLC:0A2365E0,0
2017-10-12 14:32:35:976 MESSAGE ms_filter_unlink: 
MSGenericPLC:0A2365E0,0-->MSAudioFlowControl:0A2361E0,0
2017-10-12 14:32:35:976 MESSAGE ms_filter_unlink: 
MSAudioFlowControl:0A2361E0,0-->MSDtmfGen:0A2A7688,0
2017-10-12 14:32:35:977 MESSAGE ms_filter_unlink: 
MSDtmfGen:0A2A7688,0-->MSVolume:0A2A8308,0
2017-10-12 14:32:35:977 MESSAGE ms_filter_unlink: 
MSVolume:0A2A8308,0-->MSTee:0A2A6D88,0
2017-10-12 14:32:35:977 MESSAGE ms_filter_unlink: 
MSTee:0A2A6D88,0-->MSEqualizer:0A2365A0,0
2017-10-12 14:32:35:977 MESSAGE ms_filter_unlink: 
MSEqualizer:0A2365A0,0-->MSAudioMixer:0A235F60,0
2017-10-12 14:32:35:977 MESSAGE ms_filter_unlink: 
MSFilePlayer:08A54BF0,0-->MSResample:08A54630,0
2017-10-12 14:32:35:977 MESSAGE ms_filter_unlink: 
MSResample:08A54630,0-->MSAudioMixer:0A235F60,1
2017-10-12 14:32:35:977 MESSAGE ms_filter_unlink: 
MSAudioMixer:0A235F60,0-->MSWebRTCAEC:08A55670,0
2017-10-12 14:32:35:977 MESSAGE ms_filter_unlink: 
MSWebRTCAEC:08A55670,0-->MSResample:0A2A8608,0
2017-10-12 14:32:35:977 MESSAGE ms_filter_unlink: 
MSResample:0A2A8608,0-->MSWASAPIWrite:0A2A7AC8,0
2017-10-12 14:32:35:977 MESSAGE ms_filter_unlink: 
MSAudioMixer:0A2A6C48,1-->MSResample:0A2A7188,0
2017-10-12 14:32:35:977 MESSAGE ms_filter_unlink: 
MSResample:0A2A7188,0-->MSOpusEnc:0A237720,0
2017-10-12 14:32:35:977 MESSAGE ms_filter_unlink: 
MSOpusEnc:0A237720,0-->MSMKVRecorder:0A2A6FC8,1
2017-10-12 14:32:35:977 MESSAGE ms_filter_unlink: 
MSItcSource:0A2A7008,0-->MSMKVRecorder:0A2A6FC8,0
2017-10-12 14:32:35:977 MESSAGE ms_filter_unlink: 
MSAudioMixer:0A2A8648,1-->MSAudioMixer:0A2A6C48,0
2017-10-12 14:32:35:977 MESSAGE ms_filter_unlink: 
MSTee:0A2A6D88,1-->MSAudioMixer:0A2A6C48,1
2017-10-12 14:32:35:977 MESSAGE ms_filter_unlink: 
MSAudioMixer:0A2A6C48,0-->MSFileRec:0A2A7348,0
2017-10-12 14:32:35:977 MESSAGE 
===========================================================
2017-10-12 14:32:35:977 MESSAGE                   FILTER USAGE STATISTICS       
           
2017-10-12 14:32:35:977 MESSAGE Name                Count     Time/tick (ms)    
  CPU Usage
2017-10-12 14:32:35:977 MESSAGE 
-----------------------------------------------------------
2017-10-12 14:32:35:977 MESSAGE MSResample          1700      0.0352734         
  49.1803   
2017-10-12 14:32:35:977 MESSAGE MSRtpSend           734       0.0707483         
  42.623    
2017-10-12 14:32:35:977 MESSAGE MSOpusEnc           99        0.03              
  2.45902   
2017-10-12 14:32:35:977 MESSAGE MSWASAPIWrite       869       0.00344828        
  2.45902   
2017-10-12 14:32:35:977 MESSAGE MSWebRTCAEC         733       0.0027248         
  1.63934   
2017-10-12 14:32:35:977 MESSAGE MSMKVRecorder       49        0.02              
  0.819672  
2017-10-12 14:32:35:977 MESSAGE MSWASAPIRead        734       0.00136054        
  0.819672  
2017-10-12 14:32:35:977 MESSAGE MSFilePlayer        734       0                 
  0         
2017-10-12 14:32:35:977 MESSAGE MSAudioFlowControl  363       0                 
  0         
2017-10-12 14:32:35:977 MESSAGE MSGenericPLC        734       0                 
  0         
2017-10-12 14:32:35:977 MESSAGE MSEqualizer         1095      0                 
  0         
2017-10-12 14:32:35:977 MESSAGE MSItcSource         734       0                 
  0         
2017-10-12 14:32:35:977 MESSAGE MSFileRec           99        0                 
  0         
2017-10-12 14:32:35:977 MESSAGE MSAudioMixer        2202      0                 
  0         
2017-10-12 14:32:35:977 MESSAGE MSVolume            1095      0                 
  0         
2017-10-12 14:32:35:977 MESSAGE MSAlawDec           363       0                 
  0         
2017-10-12 14:32:35:977 MESSAGE MSAlawEnc           732       0                 
  0         
2017-10-12 14:32:35:977 MESSAGE MSRtpRecv           734       0                 
  0         
2017-10-12 14:32:35:978 MESSAGE MSOpusDec           274       0                 
  0         
2017-10-12 14:32:35:978 MESSAGE MSDtmfGen           1008      0                 
  0         
2017-10-12 14:32:35:978 MESSAGE MSMKVPlayer         274       0                 
  0         
2017-10-12 14:32:35:978 MESSAGE MSItcSink           0         0                 
  0         
2017-10-12 14:32:35:978 MESSAGE MSTee               363       0                 
  0         
2017-10-12 14:32:35:978 MESSAGE 
===========================================================
2017-10-12 14:32:35:979 MESSAGE MKVRecorder: destroyed
2017-10-12 14:32:35:979 MESSAGE 
===========================================================
2017-10-12 14:32:35:979 MESSAGE                   FILTER USAGE STATISTICS       
           
2017-10-12 14:32:35:979 MESSAGE Name                Count     Time/tick (ms)    
  CPU Usage
2017-10-12 14:32:35:979 MESSAGE 
-----------------------------------------------------------
2017-10-12 14:32:35:979 MESSAGE MSResample          1700      0.0352734         
  49.1803   
2017-10-12 14:32:35:979 MESSAGE MSRtpSend           734       0.0707483         
  42.623    
2017-10-12 14:32:35:979 MESSAGE MSOpusEnc           99        0.03              
  2.45902   
2017-10-12 14:32:35:980 MESSAGE MSWASAPIWrite       869       0.00344828        
  2.45902   
2017-10-12 14:32:35:980 MESSAGE MSWebRTCAEC         733       0.0027248         
  1.63934   
2017-10-12 14:32:35:980 MESSAGE MSMKVRecorder       49        0.02              
  0.819672  
2017-10-12 14:32:35:980 MESSAGE MSWASAPIRead        734       0.00136054        
  0.819672  
2017-10-12 14:32:35:980 MESSAGE MSFilePlayer        734       0                 
  0         
2017-10-12 14:32:35:980 MESSAGE MSAudioFlowControl  363       0                 
  0         
2017-10-12 14:32:35:980 MESSAGE MSGenericPLC        734       0                 
  0         
2017-10-12 14:32:35:980 MESSAGE MSEqualizer         1095      0                 
  0         
2017-10-12 14:32:35:980 MESSAGE MSItcSource         734       0                 
  0         
2017-10-12 14:32:35:980 MESSAGE MSFileRec           99        0                 
  0         
2017-10-12 14:32:35:980 MESSAGE MSAudioMixer        2202      0                 
  0         
2017-10-12 14:32:35:980 MESSAGE MSVolume            1095      0                 
  0         
2017-10-12 14:32:35:980 MESSAGE MSAlawDec           363       0                 
  0         
2017-10-12 14:32:35:980 MESSAGE MSAlawEnc           732       0                 
  0         
2017-10-12 14:32:35:980 MESSAGE MSRtpRecv           734       0                 
  0         
2017-10-12 14:32:35:980 MESSAGE MSOpusDec           274       0                 
  0         
2017-10-12 14:32:35:980 MESSAGE MSDtmfGen           1008      0                 
  0         
2017-10-12 14:32:35:980 MESSAGE MSMKVPlayer         274       0                 
  0         
2017-10-12 14:32:35:980 MESSAGE MSItcSink           0         0                 
  0         
2017-10-12 14:32:35:980 MESSAGE MSTee               363       0                 
  0         
2017-10-12 14:32:35:980 MESSAGE 
===========================================================
2017-10-12 14:32:35:980 MESSAGE Setting DSCP to 46 for MSAudio stream.
2017-10-12 14:32:35:980 MESSAGE check OS support for qwave.lib
2017-10-12 14:32:35:981 ERROR QOSAddSocketToFlow failed to add a flow with 
error 1168
2017-10-12 14:32:35:981 MESSAGE Equalizer location: hp
2017-10-12 14:32:35:982 MESSAGE cannot set noise gate mode to [0] because no 
volume send
2017-10-12 14:32:35:982 MESSAGE Setting DSCP to 0 for MSVideo stream.
2017-10-12 14:32:35:982 MESSAGE check OS support for qwave.lib
2017-10-12 14:32:35:982 ERROR QOSAddSocketToFlow failed to add a flow with 
error 87
2017-10-12 14:32:35:982 MESSAGE linphone_call_start_media_streams() 
call=[089F8568] local upload_bandwidth=[0] kbit/s; local download_bandwidth=[0] 
kbit/s
2017-10-12 14:32:35:982 MESSAGE No valid video stream defined.
2017-10-12 14:32:35:982 MESSAGE Call 089F8568: moving from state 
LinphoneCallStreamsRunning to LinphoneCallPausedByRemote
2017-10-12 14:32:35:984 MESSAGE Linphone core [04A12800] notified 
[call_state_changed]
2017-10-12 14:32:36:182 MESSAGE channel [08CB2428]: received [1326] new bytes 
from [TCP://server0f.ve.alceo.com:5060]:
ACK sip:steven@192.168.1.38:1344;transport=tcp SIP/2.0

From: 
"dsantomaso"<sip:dsantom...@alceo.com>;tag=a292a60-2601a8c0-ea99-55013-443d0-6d2baaf4-443d0

To: "steven"<sip:ste...@alceo.com>;tag=N-F0yYl

Call-ID: a29f898-2601a8c0-ea99-55013-443d0-bb193f6-443d0

CSeq: 2 ACK

Via: SIP/2.0/TCP 192.168.1.5:5060;branch=z9hG4bK-43895-107d068a-382edaad

Via: SIP/2.0/TCP 192.168.1.38:60057;branch=z9hG4bK-443da-10a90f3f-4b5729cf

Max-Forwards: 69

Contact: 
<sip:GRUUYzdlMjc4NjNlNTRjNzQ4ZjY0ZTNiMmIyZWY5YjJkOWM=@alceo.com>;audio;video;text;application

Content-Length: 0





Phase 2)

REFER sip:steven@192.168.1.38:1344;transport=TCP SIP/2.0

From: 
"dsantomaso"<sip:dsantom...@alceo.com>;tag=a292a60-2601a8c0-ea99-55013-443d0-6d2baaf4-443d0

To: "steven"<sip:ste...@alceo.com>;tag=N-F0yYl

Call-ID: a29f898-2601a8c0-ea99-55013-443d0-bb193f6-443d0

CSeq: 3 REFER

Via: SIP/2.0/TCP 192.168.1.5:5060;branch=z9hG4bK-43895-107d068c-3b92b760

Via: SIP/2.0/TCP 192.168.1.38:60057;branch=z9hG4bK-443da-10a90f3f-3a2cc20a

Refer-To: "chuck"<sip:ch...@alceo.com>

Referred-By: "dsantomaso"<sip:dsantom...@alceo.com>

Max-Forwards: 69

Supported: gruu,join,replaces,timer,100rel

User-Agent: BCSBar 4.0.14.0

Contact: <sip:GRUUYzdlMjc4NjNlNTRjNzQ4ZjY0ZTNiMmIyZWY5YjJkOWM=@alceo.com>

Allow: INVITE,ACK,CANCEL,BYE,NOTIFY,REFER,MESSAGE

Content-Length: 0




2017-10-12 14:32:36:186 MESSAGE channel [08CB2428] [567] bytes parsed
2017-10-12 14:32:36:192 MESSAGE channel [08CB2428] [759] bytes parsed
2017-10-12 14:32:36:192 MESSAGE Incoming INVITE has ACK, dialog is happy
2017-10-12 14:32:36:193 MESSAGE Changing [server] [REFER] transaction 
[0A33A3F0], from state [INIT] to [TRYING]
2017-10-12 14:32:36:193 MESSAGE Receiving REFER request on op [0A8F8738]
2017-10-12 14:32:36:194 MESSAGE Changing [server] [REFER] transaction 
[0A33A3F0], from state [TRYING] to [COMPLETED]
2017-10-12 14:32:36:194 MESSAGE channel [08CB2428]: message sent to 
[TCP://server0f.ve.alceo.com:5060], size: [500] bytes
SIP/2.0 202 Accepted

Via: SIP/2.0/TCP 192.168.1.5:5060;branch=z9hG4bK-43895-107d068c-3b92b760

Via: SIP/2.0/TCP 192.168.1.38:60057;branch=z9hG4bK-443da-10a90f3f-3a2cc20a

From: "dsantomaso" 
<sip:dsantom...@alceo.com>;tag=a292a60-2601a8c0-ea99-55013-443d0-6d2baaf4-443d0

To: "steven" <sip:ste...@alceo.com>;tag=N-F0yYl

Call-ID: a29f898-2601a8c0-ea99-55013-443d0-bb193f6-443d0

CSeq: 3 REFER

User-Agent: Linphone Desktop/4.1.1 (belle-sip/1.6.3)

Supported: replaces, outbound

Content-Length: 0




Phase 3)

2017-10-12 14:32:36:194 MESSAGE Dialog [0AAAB390]: now updated by transaction 
[0A33A3F0].
2017-10-12 14:32:36:194 MESSAGE Call 089F8568: moving from state 
LinphoneCallPausedByRemote to LinphoneCallRefered
2017-10-12 14:32:36:194 MESSAGE Linphone core [04A12800] notified 
[call_state_changed]
2017-10-12 14:32:36:194 MESSAGE Automatically pausing current call to accept 
transfer.
2017-10-12 14:32:36:194 ERROR No reason to pause this call, it is already 
paused or inactive.
2017-10-12 14:32:36:195 MESSAGE Starting new call to refered address 
sip:ch...@alceo.com
2017-10-12 14:32:36:195 MESSAGE Found media local-ip from signaling.
2017-10-12 14:32:36:195 MESSAGE New LinphoneCall [0A959E20] initialized 
(LinphoneCore version: 3.12.0)
2017-10-12 14:32:36:196 MESSAGE Linphone core [04A12800] notified [call_created]
2017-10-12 14:32:36:196 MESSAGE Call 0A959E20: moving from state 
LinphoneCallIdle to LinphoneCallOutgoingInit
2017-10-12 14:32:36:199 MESSAGE QT: "Add call:" CallModel(0xa344cf8)
2017-10-12 14:32:36:214 MESSAGE linphone_core_get_call_history_for_address(): 
completed in 0 ms
2017-10-12 14:32:36:240 MESSAGE Linphone core [04A12800] notified 
[call_state_changed]
2017-10-12 14:32:36:240 MESSAGE Call [0A959E20], stream type [audio], multicast 
role is [inactive]
2017-10-12 14:32:36:240 MESSAGE RtpSession bound to [0.0.0.0] ports [7080] 
[7081]
2017-10-12 14:32:36:240 MESSAGE rtp_session_enable_network_simulation:DISABLING 
NETWORK SIMULATION
2017-10-12 14:32:36:240 MESSAGE Configured srtp crypto suite: 
AES_CM_128_HMAC_SHA1_80 
2017-10-12 14:32:36:240 MESSAGE Configured srtp crypto suite: 
AES_CM_128_HMAC_SHA1_32 
2017-10-12 14:32:36:240 MESSAGE Configured srtp crypto suite: 
AES_256_CM_HMAC_SHA1_80 
2017-10-12 14:32:36:240 MESSAGE Configured srtp crypto suite: 
AES_256_CM_HMAC_SHA1_32 
2017-10-12 14:32:36:240 MESSAGE Creating ZRTP engine on rtp session [0ACC10F8] 
ssrc 0xe6f0284c
2017-10-12 14:32:36:241 MESSAGE Setting DSCP to 46 for MSAudio stream.
2017-10-12 14:32:36:241 MESSAGE check OS support for qwave.lib
2017-10-12 14:32:36:241 ERROR QOSAddSocketToFlow failed to add a flow with 
error 87
2017-10-12 14:32:36:241 MESSAGE Equalizer location: hp
2017-10-12 14:32:36:242 MESSAGE cannot set noise gate mode to [0] because no 
volume send
2017-10-12 14:32:36:242 MESSAGE Call [0A959E20], stream type [video], multicast 
role is [inactive]
2017-10-12 14:32:36:242 MESSAGE RtpSession bound to [0.0.0.0] ports [9080] 
[9081]
2017-10-12 14:32:36:242 MESSAGE rtp_session_enable_network_simulation:DISABLING 
NETWORK SIMULATION
2017-10-12 14:32:36:242 MESSAGE Initializing multistream ZRTP context on rtp 
session [0AD04078] ssrc 0xfccb9c61
2017-10-12 14:32:36:242 MESSAGE Setting DSCP to 0 for MSVideo stream.
2017-10-12 14:32:36:242 MESSAGE check OS support for qwave.lib
2017-10-12 14:32:36:243 ERROR QOSAddSocketToFlow failed to add a flow with 
error 87
2017-10-12 14:32:36:243 MESSAGE Call [0A959E20], stream type [text], multicast 
role is [inactive]
2017-10-12 14:32:36:243 MESSAGE RtpSession bound to [0.0.0.0] ports [11080] 
[11081]
2017-10-12 14:32:36:243 MESSAGE rtp_session_enable_network_simulation:DISABLING 
NETWORK SIMULATION
2017-10-12 14:32:36:243 MESSAGE Contact has been fixed using proxy
2017-10-12 14:32:36:243 MESSAGE Found media local-ip from signaling.
2017-10-12 14:32:36:243 MESSAGE Don't put audio stream on local offer for call 
[0A959E20]
2017-10-12 14:32:36:243 MESSAGE Don't put video stream on local offer for call 
[0A959E20]
2017-10-12 14:32:36:243 MESSAGE Don't put text stream on local offer for call 
[0A959E20]
2017-10-12 14:32:36:243 MESSAGE ms_filter_link: 
MSRtpRecv:0AECBDE8,0-->MSVoidSink:0AECC028,0
2017-10-12 14:32:36:243 MESSAGE [sip:ste...@alceo.com] calling 
[sip:ch...@alceo.com] on op [0A9ED848]
2017-10-12 14:32:36:243 MESSAGE win32 timer resolution set to 2 ms
2017-10-12 14:32:36:243 MESSAGE Changing [client] [INVITE] transaction 
[0AE7F420], from state [INIT] to [CALLING]
2017-10-12 14:32:36:244 MESSAGE channel [08CB2428]: message sent to 
[TCP://server0f.ve.alceo.com:5060], size: [869] bytes
INVITE sip:ch...@alceo.com SIP/2.0

Via: SIP/2.0/TCP 192.168.1.38:1344;branch=z9hG4bK.c1K7XZgpg;rport

From: <sip:ste...@alceo.com>;tag=lx--NqViY

To: sip:ch...@alceo.com

CSeq: 20 INVITE

Call-ID: ugxmjAxJfB

Max-Forwards: 70

Route: <sip:server0f.ve.alceo.com;transport=tcp;lr>

Supported: replaces, outbound

Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY, MESSAGE, SUBSCRIBE, 
INFO, UPDATE

Content-Type: application/sdp

Content-Length: 185

Referred-By: "dsantomaso" <sip:dsantom...@alceo.com>

Contact: 
<sip:steven@192.168.1.38:1344;transport=tcp>;+sip.instance="<urn:uuid:cc8309b7-5c2c-45e2-8f69-d4b94553b213>"

User-Agent: Linphone Desktop/4.1.1 (belle-sip/1.6.3)



v=0

o=steven 1549 2953 IN IP4 192.168.1.38

s=Talk

c=IN IP4 0.0.0.0

t=0 0

a=rtcp-xr:rcvr-rtt=all:10000 stat-summary=loss,dup,jitt,TTL voip-metrics

m=audio 0 RTP/AVP 0

a=inactive


2017-10-12 14:32:36:244 MESSAGE Call 0A959E20: moving from state 
LinphoneCallOutgoingInit to LinphoneCallOutgoingProgress
2017-10-12 14:32:36:244 MESSAGE Linphone core [04A12800] notified 
[call_state_changed]
2017-10-12 14:32:36:244 MESSAGE Dialog [0AAAB390]: now updated by transaction 
[0ADCDFD8].
2017-10-12 14:32:36:244 MESSAGE Changing [client] [NOTIFY] transaction 
[0ADCDFD8], from state [INIT] to [TRYING]
2017-10-12 14:32:36:244 MESSAGE channel [08CB2428]: message sent to 
[TCP://server0f.ve.alceo.com:5060], size: [606] bytes
NOTIFY sip:GRUUYzdlMjc4NjNlNTRjNzQ4ZjY0ZTNiMmIyZWY5YjJkOWM=@alceo.com SIP/2.0

Via: SIP/2.0/TCP 192.168.1.38:1344;branch=z9hG4bK.Vw9ydViqO;rport

From: "steven" <sip:ste...@alceo.com>;tag=N-F0yYl

To: "dsantomaso" 
<sip:dsantom...@alceo.com>;tag=a292a60-2601a8c0-ea99-55013-443d0-6d2baaf4-443d0

CSeq: 111 NOTIFY

Call-ID: a29f898-2601a8c0-ea99-55013-443d0-bb193f6-443d0

Max-Forwards: 70

Subscription-State: active

Event: refer

Content-Type: message/sipfrag

Content-Length: 20

User-Agent: Linphone Desktop/4.1.1 (belle-sip/1.6.3)

Route: <sip:192.168.1.5:5060;transport=TCP;lr>



SIP/2.0 100 Trying


2017-10-12 14:32:36:319 MESSAGE channel [08CB2428]: received [548] new bytes 
from [TCP://server0f.ve.alceo.com:5060]:
SIP/2.0 100 Trying

From: <sip:ste...@alceo.com>;tag=lx--NqViY

To: <sip:ch...@alceo.com>

Call-ID: ugxmjAxJfB

CSeq: 20 INVITE

Via: SIP/2.0/TCP 192.168.1.38:1344;rport;branch=z9hG4bK.c1K7XZgpg

Content-Length: 0



SIP/2.0 100 Trying

From: "steven"<sip:ste...@alceo.com>;tag=N-F0yYl

To: 
"dsantomaso"<sip:dsantom...@alceo.com>;tag=a292a60-2601a8c0-ea99-55013-443d0-6d2baaf4-443d0

Call-ID: a29f898-2601a8c0-ea99-55013-443d0-bb193f6-443d0

CSeq: 111 NOTIFY

Via: SIP/2.0/TCP 192.168.1.38:1344;rport;branch=z9hG4bK.Vw9ydViqO

Content-Length: 0




2017-10-12 14:32:36:320 MESSAGE channel [08CB2428] [217] bytes parsed
2017-10-12 14:32:36:321 MESSAGE channel [08CB2428] [331] bytes parsed
2017-10-12 14:32:36:321 MESSAGE Found transaction matching response.
2017-10-12 14:32:36:321 MESSAGE Changing [client] [INVITE] transaction 
[0AE7F420], from state [CALLING] to [PROCEEDING]
2017-10-12 14:32:36:322 MESSAGE op [0A9ED848] : set_or_update_dialog() 
current=[00000000] new=[00000000]
2017-10-12 14:32:36:322 MESSAGE Op [0A9ED848] receiving call response [100], 
dialog is [00000000] in state [BELLE_SIP_DIALOG_NULL]
2017-10-12 14:32:36:322 MESSAGE Found transaction matching response.
2017-10-12 14:32:36:322 MESSAGE Changing [client] [NOTIFY] transaction 
[0ADCDFD8], from state [TRYING] to [PROCEEDING]
2017-10-12 14:32:36:322 MESSAGE Dialog [0AAAB390]: now updated by transaction 
[0ADCDFD8].
2017-10-12 14:32:36:322 MESSAGE op [0A8F8738] : set_or_update_dialog() 
current=[0AAAB390] new=[0AAAB390]
2017-10-12 14:32:36:322 MESSAGE Op [0A8F8738] receiving call response [100], 
dialog is [0AAAB390] in state [BELLE_SIP_DIALOG_CONFIRMED]
2017-10-12 14:32:36:322 MESSAGE Changing [server] [REFER] transaction 
[0A33A3F0], from state [COMPLETED] to [TERMINATED]
2017-10-12 14:32:36:322 MESSAGE Server REFER transaction [0A33A3F0] terminated
2017-10-12 14:32:36:322 MESSAGE Transaction [0A33A3F0] deleted
2017-10-12 14:32:36:403 MESSAGE channel [08CB2428]: received [446] new bytes 
from [TCP://server0f.ve.alceo.com:5060]:
SIP/2.0 200 OK

From: "steven"<sip:ste...@alceo.com>;tag=N-F0yYl

To: 
"dsantomaso"<sip:dsantom...@alceo.com>;tag=a292a60-2601a8c0-ea99-55013-443d0-6d2baaf4-443d0

Call-ID: a29f898-2601a8c0-ea99-55013-443d0-bb193f6-443d0

CSeq: 111 NOTIFY

Via: SIP/2.0/TCP 192.168.1.38:1344;rport;branch=z9hG4bK.Vw9ydViqO

Supported: gruu,join,replaces,timer,100rel

Contact: <sip:GRUUYzdlMjc4NjNlNTRjNzQ4ZjY0ZTNiMmIyZWY5YjJkOWM=@alceo.com>

Content-Length: 0




2017-10-12 14:32:36:405 MESSAGE channel [08CB2428] [446] bytes parsed
2017-10-12 14:32:36:405 MESSAGE Found transaction matching response.
2017-10-12 14:32:36:405 MESSAGE Changing [client] [NOTIFY] transaction 
[0ADCDFD8], from state [PROCEEDING] to [COMPLETED]
2017-10-12 14:32:36:405 MESSAGE Dialog [0AAAB390]: now updated by transaction 
[0ADCDFD8].
2017-10-12 14:32:36:405 MESSAGE op [0A8F8738] : set_or_update_dialog() 
current=[0AAAB390] new=[0AAAB390]
2017-10-12 14:32:36:405 MESSAGE Op [0A8F8738] receiving call response [200], 
dialog is [0AAAB390] in state [BELLE_SIP_DIALOG_CONFIRMED]
2017-10-12 14:32:36:405 MESSAGE Changing [client] [NOTIFY] transaction 
[0ADCDFD8], from state [COMPLETED] to [TERMINATED]
2017-10-12 14:32:36:405 MESSAGE Client NOTIFY transaction [0ADCDFD8] terminated
2017-10-12 14:32:36:621 MESSAGE channel [08CB2428]: received [325] new bytes 
from [TCP://server0f.ve.alceo.com:5060]:
SIP/2.0 488 Not acceptable here

From: <sip:ste...@alceo.com>;tag=lx--NqViY

To: <sip:ch...@alceo.com>;tag=LGqECcI

Call-ID: ugxmjAxJfB

CSeq: 20 INVITE

Via: SIP/2.0/TCP 192.168.1.38:1344;rport;branch=z9hG4bK.c1K7XZgpg

User-Agent: LinphoneAndroid/3.2.7 (belle-sip/1.6.1)

Supported: replaces,outbound

Content-Length: 0




2017-10-12 14:32:36:622 MESSAGE channel [08CB2428] [325] bytes parsed
2017-10-12 14:32:36:622 MESSAGE Found transaction matching response.
2017-10-12 14:32:36:622 MESSAGE Changing [client] [INVITE] transaction 
[0AE7F420], from state [PROCEEDING] to [COMPLETED]
2017-10-12 14:32:36:622 MESSAGE channel [08CB2428]: message sent to 
[TCP://server0f.ve.alceo.com:5060], size: [429] bytes
ACK sip:ch...@alceo.com SIP/2.0

Via: SIP/2.0/TCP 192.168.1.38:1344;branch=z9hG4bK.c1K7XZgpg;rport

Call-ID: ugxmjAxJfB

From: <sip:ste...@alceo.com>;tag=lx--NqViY

To: <sip:ch...@alceo.com>;tag=LGqECcI

Contact: 
<sip:steven@192.168.1.38:1344;transport=tcp>;+sip.instance="<urn:uuid:cc8309b7-5c2c-45e2-8f69-d4b94553b213>"

Route: <sip:server0f.ve.alceo.com;transport=tcp;lr>

Max-Forwards: 70

CSeq: 20 ACK

Content-Length: 0



 
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