asterisk question about ports

i have asterisk based system with grandstream phones regiestered to a remote system. What assigns ports to the regeistered phones? The internet carrier? The router? The asterisk server? I used command sip show peers. I have multiple phones registered with the same port. Is this normal?

Hi,
It is quite normal for 'phones to register on the same network port. Typically it is the registering end that defines the port it registers with i.e. the phone

Quote:

Hi, It is quite normal for 'phones to register on the same network port. Typically it is the registering end that defines the port it registers with i.e. the phone

thanks for the education. I did look at my phones and they all are assigned to port 5060 udp. This is normal across all sites that I have. From what i observed the router manipulates the 5060 and assigns another port number. I had a router that would assign the same port number in the same lan and it caused confusion on where the calling phone would ultimately ring. Example dial 1000, and go to 1033 because in the asterisk server it had port (example also, 50085 assigned to two registered phones. I replaced my routers and the problem went away.