How do Session Initiation Protocol (SIP) providers handle E911 service calls?
Plain and simple: SIP providers use an E911 gateway service such as 911Enable, 911 ETC and Bulk911. Otherwise, you put a label on every phone that states: "E911 calls cannot be placed from this telephone." Another option is to provision E911 services using traditional services.
For more information: Check out our E911 services primer.
This was first published in June 2013