I have an SIP trunk to an ITSP, and it’s not registering because the provider requires the Authorization SIP header to be included in the first REGISTER request, which Cisco routers don’t do by default. My provider has security and DDoS rules that dr...

Our security team has detected a vulnerability with the Cisco UCS C220 M4S CIMC. We need your assistance in addressing this or finding any \justification from Cisco regarding it.Here is the vulnerability:https://www.tenable.com/plugins/nessus/187201C...

I have an issue with calls originating from PSTN and redirecting back to PSTN. That mean when I have incoming call from PSTN, and I have the call forward to PSTN mobile number on my extension the call does not go through but get disconnected.Calls fr...

Hi All,For incoming FXO calls auto attendant does not respond to digit entry from certain provider, whereas recognize digit entries from other providers normally and the forwarded the entered extension normally.Call flow:PSTN caller – FXO – (Router t...