Adapted sip_session2 script to new basic SIP objects

Ignore-this: 756b65a3984d2ffbbe8ce3b59adaea3a

darcs-hash:20090616100851-1e3d8-828beb0e0d6ff706ead08a84ea6395724c0a0e12
Adapted sip_register script to new basic SIP objects

Ignore-this: b57103bd46f3b214502fdc0d9188291d

darcs-hash:20090616100910-1e3d8-bd51dcb9d1a326d2bebbfb6981c53984c30bb7b7