A fallback strategy for a system (700) and method (200) is provided for rerouting a call that fails to be established utilizing a first set of constraints in a communication network system. This strategy enables the communication network system to utilize a look-around-first type of preemption that avoids...http://www.google.se/patents/US5402478?utm_source=gb-gplus-sharePatent US5402478 - System and method for call-by-call source routing with rule-based fallbacks
