SIP SoftPhone on Pàdé

Is it possible to get a SIP Soft Phone working with/by side Pàdé? I need to make calls, internal and externals and to receive the same. The idea is to use just one Application for all the needed features (chat, file/audio sending, meeting, screen sharing, phone, etc.). At this time I can do everything with Pàdé except the telephone calls.
Could I get it working with Pàdé or I need to use obligatorily another Application?
Thanks in advance.
Cheers!