我正在从Debian的官方站点构建Linphone：
$ ./linphone --version
linphone 4.1.1-655-g95245907
$ ./linphonec --version
version: 3.12.0
我正在尝试使用 linphonec 进行语音通话以测试电话，但收到错误消息：
> call 891********8
2019-03-06 17:13:20:391 liblinphone-error-LinphoneCore has video disabled for both capture and display, but video policy is to start the call with video. This is a possible mis-use of the API. In this case, video is disabled in default LinphoneCallParams
Error from linphone_core_invite.
好吧，可以启用仅语音设置吗？是的，有可能：
> help call
'call <sip-url or number> [options]' : initiate a call to the specified destination.
Options can be:
--audio-only : initiate the call without video.
--early-media : sends audio and video stream immediately when remote proposes early media.
好的选择-仅音频。试试吧：
> call 891********8 --audio-only
2019-03-06 17:14:01:951 liblinphone-error-LinphoneCore has video disabled for both capture and display, but video policy is to start the call with video. This is a possible mis-use of the API. In this case, video is disabled in default LinphoneCallParams
Error from linphone_core_invite.
此选项不起作用。
问：如何在默认的LinphoneCallParams中禁用视频？怎么做？答案 0 :(得分：0)
我遇到了类似的问题，我想出的解决方案可能会有所帮助。
我的问题：
linphonec> call 5201
2019-04-13 02:47:38:771 liblinphone-error-LinphoneCore has video disabled for both capture and display, but video policy is to start the call with video. This is a possible mis-use of the API. In this case, video is disabled in default LinphoneCallParams
Error from linphone_core_invite. <----- THE REAL PROBLEM
解决方案是包括域。对我来说是
linphonec> call sip:5201@172.31.0.1
2019-04-13 02:53:00:103 liblinphone-error-LinphoneCore has video disabled for both capture and display, but video policy is to start the call with video. This is a possible mis-use of the API. In this case, video is disabled in default LinphoneCallParams
Establishing call id to sip:5201@172.31.0.1, assigned id 2
Call 2 to sip:5201@172.31.0.1 in progress.
Media streams established with sip:5201@172.31.0.1 for call 2 (audio).