A workaround for the previous scenario is to base emergency services routing off of the same network location information that might be defined for Call Admission Control and Media Bypass.
After the sites are configured, follow these steps for each site that has an E911 registered phone circuit:
1. Create a PSTN usage and voice route for the emergency call.
2. Create a user location policy with emergency services enabled. Enter the emergency services number and mask.
3. Assign the PSTN usage to the location policy.
4. Assign the location policy to the network site.
The end result is that Lync clients that sign in on network subnets associated to that site automatically receive that PSTN usage, and it is inserted at the top ...