[Users] Inbound failover from third-party PSTN

[Daryl Sanders]

Greeting Everyone,

I hit a bit of a road block in my design. I'm using SRV for proxy
failover on the customer side, but I'm wondering if third-party PSTN
providers will support SRV when delivering calls to my SERs. I want to
make sure if the PSTN provider cannot reach one SER they try another.
I've only talked to a couple providers so far, and it seems they want
to just send traffic to an IP address. Is this the norm? Is HA with
heartbeat and a single IP the only solution here?

Thanks!
- Daryl