RTC Client API - How to send # and * in uri?

I'm trying to send a call to "#98" using

oSession = oClient.CreateSession(RTCCORELib.RTC_SESSION_TYPE.RTCST_PC_TO_PC, "", oProfile2, 1);
//oSession = oClient.CreateSession(RTCCORELib.RTC_SESSION_TYPE.RTCST_PC_TO_PHONE, "", oProfile2, 1);


oParticipant = oSession.AddParticipant(strRemoteURI, "Dummy Name");

in strRemoteURI, it works fine for SIPs and phone numbers WITHOUT the "#" and "*" characters. How can I connect to a nuumber like "#98" or anything with an "*" in the uri

I tried sending %23 instead of "#" and %2A instead of "*", but it didn't worked.

How can I do it

Thanks in advance!