I have 2 domains jainaditya.in (domain purchased from GoDaddy and currently parked) and techphernalia.com (domain and web hosting from one.com). I created a subdomain ajain.techphernalia.com.
Requirement : When I point to jainaditya.in it should open ajain.techphernalia.com, with addressbar still displaying jainaditya.in.
Working Example : Done similar kind of changes where sms.techphernalia.com is displaying content from some different IP (I do not know from where but lets call this B).
How I did this : Created a CNAME record for sms.techphernalia.com, waited for 2 days, called B and he did some changes on his servers and it reflected.
What is problem : Created CNAME record on jainaditya.in for www.jainaditya.in, request goes out from GoDaddy's servers and reaches one.com servers. But do not know what changes are required in techphernalia.com DNS records to display content.