我正在尝试将SIPiOS应用程序连接到由RingCentral托管的数字SIP线路。RingCentral给出的线路设置是:SIPDomain:sip.ringcentral.com:5060Outboundproxy:sip11.ringcentral.com:5090Username:12148656048Password:-password-AuthorizationID:-sameaspassword-所以,我已经像这样设置了SIP应用程序:-IdentitySettings-Displayname:Line1Publicid:sip:12148656048@sip.ringc