Text to 9-1-1

Text messaging is the world’s most popular form of communication, and it’s making an imprint on emergency services. Service providers are now required to provide Text to 9-1-1 services.

Comtech enables text messaging service providers to provide seamless text communication between 9-1-1 text callers and public safety answering points (PSAPs).

Text to 9-1-1

Product Details

Text Messaging Service Providers

Comtech supports Text to 9‑1‑1 for both traditional Short Message Service (SMS) using SMPP protocol or Text Messaging over IMS Core or IP Network using SIP MSRP protocols.

When Comtech TCC receives a Text to 9‑1‑1 call, Comtech TCC determines the destination PSAP and returns routing instructions for the Text Messaging Service Provider to deliver the 9‑1‑1 texts to the PSAP. Alternatively, Comtech can route the Text to 9‑1‑1 call to the PSAP on behalf of the Text Messaging Service Provider.


Comtech’s Text to 9‑1‑1 solution supports legacy Teletype (TTY) and Internet Protocol (IP)-enabled PSAPs. For IP enabled PSAPs, Comtech offers https based Geospatial Emergency Messaging 9‑1‑1 (GEM9‑1‑1®) web portal or Comtech’s EMedia® web portal with advanced reports & transfer capabilities.

Comtech’s solution also includes Coarse Location Service (CLS) / Gateway Mobile Location Center (GMLC) / Evolved GMLC (EGMLC) and ALI Link™. ALI Link provides nationwide connectivity to Automatic Location Identification (ALI) databases. The Comtech TCC supports Text Messaging Service Providers using SMPP interface or SIP MSRP interface.

Industry Compliance

Comtech TCC complies with the Alliance for Telecommunications Industry Solutions (ATIS)/Telecommunications Industry Association (TIA) J-STD-110a and the National Emergency Number Association (NENA) i3 standard.

Features & Benefits

key featuresbenefits
SMPP Ingress InterfaceSupports Text to 9‑1‑1 service for Text Messaging Service Providers using traditional Short Message Service Center (SMSC).
SIP/MSRP Ingress InterfaceEnable Text to 9‑1‑1 service over IMS Core or IP Network.
Location by Reference (LbyR)Allow a Text Messaging Service Provider to utilize a centralized location server to provide callers locations.
Location by Value (LbyV)Enable a Text Messaging Service Provider to include a location in the Text to 9‑1‑1 request
Location RebidProvide PSAP the capability to request an updated location.
Multiple PSAP Interface TypesProvide Text to 9‑1‑1 service to TTY PSAP, https based PSAP and SIP MSRP based PSAP.
PSAP TransferTransfer a Text to 9‑1‑1 session between PSAPs.
Session-Like CommunicationGroup and present messages between a text caller and a PSAP telecommunicator in a session like communication.

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