Plantronics + Polycom.
Now together as
in the NAT settings for the above phone when i enter values the phone faills to connect to the sip provider.
phones are upgraded to UC4
does the IP address, Signalling port, Media and keep alive all have to be filled in.
i have tried it with both port forwarding at the router and no port forwarding.
shame these things dont do STUN.
have multiple grandstream phones working with rtp and sip ports changed without issue