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Tag Archives: Wireless

UMA is also known as 3GPP GAN – and is used to provide a an internet based access point for mobile communications over the internet – in for example, areas where signal is weak, but there is a good wireless internet connection, this internet connection can be utilised to provide good quality voice calls over the data network.

Given that there is a distinct lack of documentation on appropriate firewall configuration for UMA on the net, I thought I’d document the ports and protocols required to get this working.

UMA requires:

UDP/500
UDP/4500
IP Protocol 50 (ESP)
IP Protocol 51 (AH)

In the UK this traffic needs to be permitted to the Orange network (no other carriers support this service yet) 193.35.128.0/20 (thanks Andy for this!)