I have just installed 1 x Grandstream GXP-2000 VOIP Phone (Sipgate Service Provider) with some degree of success (See below for problems). However as this is my first experience with VOIP im a little confused about which ports to forward and what each port does. I don’t want to open a huge range of ports as that is a poor installation.
The router is a Netgear FVG318 & i have forwarded the following ports
TCP/UDP - 10000 : 10012 (I believe this is for network traversal, however i have turned it off on the phone as it didn’t want to work at all)
UDP - 5060 : 5062 (As far as im aware this port & the one below are for voice in and out, correct me if im wrong!)
UDP - 5004 : 5008
UDP - 30000 : 30021 (I have no idea what this port is for or if i need it)
TCP/UDP - 3478
The only ports i can see in the phones menu are 5004 in advanced settings 5060 Line 1 & 5062 line 2 all the other ports above are what i found on the Sipgate site. I find it very frustrating that the ports you need to forward aren’t just listed in the phones settings it seams that with VOIP there are a lot of hidden settings (Or is this just me)
If line one is put on hold then taken off all sound is lost then it loses the server. However line two (Separate Sipgate Account) is ok. Also it doesn’t seam to work all the time it’s too unreliable to be an office phone yet.
I would be greatful of any help.