The telephone numbers you are using, supplied by the various service providers, do not appear on the OBiTALK dashboard. All the OBi cares about are the login credentials (for Google Voice, this is accomplished via OAUTH 2.0 security token exchange, or for SIP VoIP service providers, your SIP username and password).
The Anveo 911 service is provisioned independently of any other service, and it doesn't need your Google Voice telephone number.