I had the same issue a few days ago. I received VoIP calls on my Linphone from 
unknown sources every ~10 minutes. I solved it by disabling IGMP Proxying and 
disabling SIP ALG on my Internet Router. I use a Netgear Router and this is 
their explanation of those functions:
# Disable IGMP Proxying
The IGMP Proxying function lets a LAN PC to receive the multicast traffic it is 
interested in from the Internet. You can click this check box to disable the 
function if you do not need it.

# Disable SIP ALG
Some VoIP applications do not work well with the SIP ALG. Enabling this option 
to turn off the SIP ALG may help your VoIP devices to create/accept a call 
through the router.

Best regards
Stefano
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