There is a lot of flexibility with regard to routing calls. Mitel's Clearspan is fully compliant with NENA specifications and has the built-in ability to route E911 calls to the appropriate PSAP or local public safety office. In addition, Mitel's Clearspan has the ability for advanced E911, such as dynamic endpoint tracking, security desktop alerting and integration with VoIP positioning center services. It is the responsibility of the local institution to maintain accurate entries in the PS-ALI database through their LEC.
If Mitel's Clearspan is chosen to replace an organization's dial tone service, Mitel will route calls as requested by the customer, regardless of who provides trunks. If Mitel is not chosen as a dial tone replacement, but Centurylink is chosen for SIP trunks, the organization will need to route the calls appropriately. Centurylink has worked with a variety of customers and should be able to accept call route directions and send the call to the appropriate PSAP if desired.