We have had wired broadband service delivered to these premises for almost ten years, supplied by six vendors: Telstra Bigpond, iiNet, Amaysim, Southern Phone, Exetel and then Sumo.
Problems were experienced with the existing Engin VOIP service and a new MyNetPhone VOIP service.
Neither worked from either of my broadband gateways’ integrated ATAs, but they did work to some extent from a stand alone ATA on the internal network.
Notably, the address assigned to the outside of the gateway is a private IP address, and therefore this must be at least one more stage of address translation between the gateway and the public Internet.
Network Address Translation (NAT) frustrates VOIP which has to sense and work around the NAT scheme in use (there are no standards, implementations are proprietary), and cascaded implementations are likely to further frustrate operation.
I did manage to get the stand alone ATA to connect and handle incoming calls and outgoing calls by enabling STUN to assist the SIP addressing operations… but the connection would fail after a few days, and the only measure that was effective in restoring VOIP service was to reboot the gateway. Rebooting the gateway caused a new address assignment and obviously a fresh table of address translations in Optus’ NAT box… and things worked for a few days again, then another freeze.
A fault report was lodged but there was no response after two days, this lack of ongoing reliability of the Sumo / Optus / NBN service for VOIP was reason to quit them.
It was a pity to need to quit Sumo / Optus / NBN, because download speed was consistently good.
Above is a plot of download speeds over the month of service. Continue reading Sumo broadband Internet access
Last update: 24th February, 2019, 12:46 PM