XX-11214: There are special cases where we might want to rewrite certain identity. A good example is if a set of users share a common credential like ~~id~sipXprovision Rewrite: ~~id~sipXprovision~XXXYYY => ~~id~sipXprovision Rewrite: ~~id~sipXprovision~XXXYYY@somedomain.com => ~~id~sipXprovision@somedomain.com