Adapted sip_subscribe_presence script to new basic SIP objects

Ignore-this: 3e169124427aa9d625b2d054bc37c259

darcs-hash:20090616101140-1e3d8-7cef69f318793d6322818b31a59ec4aa23964b4d
Adapted sip_publish_presence to new basic SIP objects

Ignore-this: f16a0c6e4aa4ab5f1ae3ee47465d4ce

darcs-hash:20090616101203-1e3d8-0d8acc0d1fb26eaff538cf17f8f7241a72b30867