Incoming Calls failing from Flowroute

Starting this morning, many Switchvox clients using Flowroute as their SIP Provider stopped receiving incoming calls. 

Other symptoms that you will see for this issue:

• Outgoing calls are still working fine.

• The Connection Status still shows the provider as connected and Registered.

• Flowroute reports this is failing at the customer's PBX, which is sending a "401 Unauthorized" response to the inbound call Invite.

Why this is happening:

• At some point around 10:30 this morning, Flowroute made a change in how they are sending call Invites from their host address IP ranges.

• In Switchvox, on incoming call Invites from IP addresses that are not the provider host address, Switchvox will always request an authentication check (401 Unauthorized)

• Flowroute will never Authenticate on inbound call Invites. They will respond to 401 only with "ACK" (Acknowledged), and then either hang up or try again with a new Invite from one of their other host IP addresses.

How to Resolve:

In your Switchvox Admin portal, go to Setup > VoIP Providers.
Hit the Modify pencil to make the following changes to the VoIP Provider [Flowroute] Connection Settings:

• Confirm "Always Trust this Provider" is ON

• Manually add Flowroute's remaining 32 alt IP addresses to the Provider Host List (this does not accept the "/" character, so these cannot be a range):