On the low success rate of dialing mobile phone number(关于拨打手机号,成功率不高的问题)

[zhaochuang01]

The SIP server is on Alibaba cloud. How to solve this problem? Linphone and pjsua have the same problem. I don't know what the problem is. I hope to reply(拨打很多次,只有一次成功,sip服务器在阿里云上面.这个问题如何解决,linphone和pjsua也有同样的问题,不知道是什么问题,希望回复一下)