These are the default ports used by an RRC:
80(TCP), for browsing to the RRC using a web browser.
13000(UDP), SIP port used for connecting to the RRC
13001(UDP), for streaming audio
13002(UDP), for radio command data etc
(There is also 23(TCP) used for Telnet)
For the Nano app port 80 isn't used at all since it does not browse to the RRC, so there should never be a convention xxx.xxx.xxx.xxx:YYY, only xxx.xxx.xxx.xxx used in the SIP contact input box in the Nano app.