Some Jet customers have reported receiving multiple "ghost" calls on their Yealink IP phones. When answered, there is no one on the other end of the call.
This issue will present as phones endlessly ringing and showing calls from a 3 or 4-digit Caller ID that does not exist as a Jet extension number? (Eg. 1234)
The caller ID of these calls could also show as a text entry of "Asterisk", "sipvicious", "FreeSWITCH", "PBX", "FPBX", "Cisko", etc.
These calls will not show up in your Inbound Calls report on your Jet Hub portal.
Why is this happening?
Receiving multiple phantom calls could be a result of malicious intent. People can use programs such as SIPVicious to probe networks and compromise IP phones.
SIPVicious is a free SIP security testing suite, which scans IP addresses looking for SIP devices, helps identify active PBX extensions and provides a mechanism to crack SIP user passwords.
Securing your router traffic
The only resolution is to lock down the SIP ports 5060 and 5061 on your router to only allow inbound and outbound traffic on IP phones to go to and come from Jet Interactive domains or IP addresses. You may need the help of an IT professional to do this.
The IP addresses and domains you should be accepting traffic from are as follows:
Please be advised, Jet Interactive reserves the right to change IP addresses used by PBX services at any time and without notification.
Please check this article for updates as required.
To lock down the SIP ports on the router, your router must have a functionality commonly referred to as Access Control List (ACL). This functionality allows a user to specifically set local IP Addresses to only communicate to the Jet Interactive IP addresses.
More information on router setups and system compatibilty can be found in the articles below.