Adapted Subscription to new basic SIP objects

Ignore-this: 461eaa29fbb193ca3a83d3a58f48da8e

darcs-hash:20090616095244-1e3d8-9e81cb5c628ef1d2f42d1d5a8594719a86a4785c
Adapted Request to new basic SIP objects

Ignore-this: 50827324f0c681ebe8bc995bce5889d5

darcs-hash:20090616095312-1e3d8-788e4b3b167a50e221f044aa524712b89ac528f3