Lync conversation chat doesn't open in Android

Hello,

I'm building a mobile hybrid application and i'm facing with an issue for several days. I don't know if it's possible or not, but I have the need to open the Lync conversation chat by using the window.open javascript call.

I tried the following URL schemes, but without luck:

• window.open('sip:'+ address, '_system'); -- doesn't open Lync at all
• window.open('sip://'+ address, '_system'); -- doesn't open Lync at all
• window.open('lync://'+ address, '_system'); -- only opens Lync, but no conversation chat
• window.open('lync://'+ address + '?chat', '_system'); -- only opens Lync, but no conversation chat
• window.open('lync:'+ address + '?chat', '_system'); -- Lync crashes

I managed to open conversation chat on my desktop browser simply with IM:<sip:user@address.com>, but it doesn't work on Android.

I didn't test such calls on iOS, but several forums saying that sip: should work.

Which is the action to open the conversation chat?

Thanks in advance.