Vivotek 3GPP - Manual (Page 9)

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8 Confidential
(2) Without IP router
The network setting becomes more straightforward in this scenario. Either fixed IP
or PPPoE can be set in network camera. It depends on which kind of internet service
user are subscribing. If PPPoE is applied, DDNS is strongly recommended since IP is
floating. There are several DDNS services supported in VIVOTEK network camera. Pick
up anyone you prefer! Without IP router, port forwarding is no more an issue and you
don’t have to set each camera with different streaming port. You can just leave all of
them default value. In fact, leaving rtsp port as default one will get the most compatibility
for handsets.