The Netphone and our intercom product line consist of the same UDP port 5060. If you are having issues with dialling out or receiving calls on your Netphone with our intercom system connected to the same router you will need to either enable/disable the SIP ALG (Application Layer Gateway).
Symptoms of SIP ALG may include
Error messages for incoming calls (e.g. “The caller you have dialled is no longer in service.”)
Example.