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Ghost calls occur when one or more SIP devices ring at random times from call displays such as 100, 1000, Anonymous or some other unrecognized ID. If answered, there is silence from the other end.
The problem arises when SIP calls go out to too many IP addresses on the standard SIP port, 5060. By default, many phones connect to service providers and listen for incoming calls on port 5060. This "listen port" or "local port" can be changed to non-standard values to rectify this problem. For instance, we recommend port numbers between 9000 and 40,000. Basic firewalls sometimes default to this same port, while higher end network devices scramble ports, ensuring port 5060 does not remain open.
There are many solutions for this problem. Typically, any one of them will correct the issue.
Please see sample instructions on how to disable anonymous SIP calls below. Other phones should have very similar settings.
Grandstream DP 715
Grandstream GXP 2130