I downloaded "rem_iOS_SDK-10.6.2.10000-4" from sample SDK section. I found an demo which is only for iPad.
When i ran this demo, i prompted with screen where i have to send the details as POST request with url "https://10.137.96.87/csdk-sample/SDK/login" where 10.137.96.87 is server address. What i have to put in Username and Password field to continue within app.
Attached is the screenshot of first screen.
The sample app in the download was a test to allow inbound calling which is not the intended use of the SDK. It's inclusion was a mistake.
You could modify the example to make an inbound call to a SIP end point but you would need to provide a session token as outlined in https://developer.cisco.com/media/remote-expert-mobile-developer-tutorials/web-sdk/07-managing-voice-video-call-outside-…
This is the forerunner to the REM Advanced CSDK which will be released and documented as part of REM 11.x