If the carrier does not have an i2 connection to the local PSAP connection, calls will get routed to an Emergency Call Relay Center (ECRC). This is more common with VoIP carriers than a CLEC.

These centers are usually not local, and they do not get address information when you call. They have to take the information and then they call the local PSAP and verbally relay the provided information. It can slow down the process.

The only thing you can set in the Toshiba is the number that is sent to the carrier for e911. Normally you would send the BTN, but there are cases when you would want to set a DID instead, for example in a large facility with multiple buildings.