One of our SIP providers is a low traffic backup that’s rarely used. We got reports from users that inbound calls to DIDs on that alternate ITSP were failing. I did a few test calls to those DIDs and they all returned fast-busy and nothing showing up in our logs. I then placed an outbound call on that same ITSP trunk and that went through fine. Afterwards calls to those same DIDs were now passing normally.
Before I reach out to the provider, could there be something I’m missing on my end?
The only two settings I have setup under Connectivity > Trunks > “ITSP” > sip Settings > Outgoing> PEER Details is
type=peer
host=x.x.x.x
Incoming is empty
There is no firewall between our system and the ITSPs router.