You need to buy a DID that supports e911, such as

来源: 于 2009-09-07 14:19:13 [旧帖] [给我悄悄话] 本文已被阅读：次

CallCentric and SipGate etc. E911 is not free, at least $2/mon added to the DID cost.

Instead, I let 911 goes to my cell phone. All cell phones support e911.