Access for 9-1-1 and Telephone Emergency Services

Relationship Between Primary and Secondary PSAPs

Primary PSAPs (9-1-1 answering points) often transfer calls to secondary PSAPs (such as fire or emergency medical services) if they do not dispatch those services directly from the primary PSAP. In those transfer situations, PSAPs must correctly transfer TTY calls, as they do voice calls. Secondary PSAPs have the same responsibilities under the ADA as do primary PSAPs, and they must be able to receive transferred TTY calls as efficiently and as effectively as voice calls.