Abhilash,
Attributes to be provided to SP are typically configured on the IDP side in a vendor-specific way.
You can configure SSO Circle to send additional attributes by logging in to your account at https://idp.ssocircle.com/sso/UI/Login, select Manage Metadata, press "Add new Service Provider" (first remove the existing one if present) and make sure to check SAML attributes to be sent in AuthnRespose in the section "Attributes send in assertion (optional)". SSO Circle currently only supports attributes FirstName, LastName and EmailAddress.
SP can advertise attributes required to be provided by IDP in its metadata using elements RequestedAttribute. Support for this mechanism may vary among IDP and SP implementations. SAML protocol also allows SP to advise IDP on what attributes to send by including attribute AttributeConsumingServiceIndex in the AuthnRequest, but again this feature is not usually supported. Some custom SAML profiles define custom way to do this using the AuthnRequest's Extensions element.
Cheers, Vladimir Schafer