On 2019-04-17 14:44, Gary Pope wrote:
Anybody tackled bridge-mode modem on NBN and retained VOIP ?
My understanding is that VOIP on NBN is just SIP over IP over NBN. So presumably any SIP phone or SIP ATA (for analog phones) should work. Or something like Asterisk/Freeswitch. This also explains why a bridge modem cannot provide VOIP, because it doesn't actually have access to the IP network layer.
This does require you have access to the SIP connection details, and some retailers may not give this information (???), especially if they configure the modem on your behalf. I think my ISP, Internode looks fine here, I don't know about anyone else.
You probably will need to take into account NAT and - if applicable any firewalls - however, which require some thought with SIP. SIP isn't exactly NAT friendly (although I believe there are solutions), or firewall friendly (depending on your firewall you might have SIP tracking support which helps considerably). If you have a fixed IP public address it will probably help considerably.
Disclaimer: I don't have NBN yet, so can't verify any of this.
Thanks for everyone's input so far, and particularly Andrew, who has shared some terrific insights. Some questions need my clarification on all this.
1. This is for my home, so just the one old phone number we've had for 35 years needs retaining and perhaps something like a spa112 phone adaptor will do.
I had a really great talk to with some people who package pfsense boxes we all know: yawarra.com.au (now part of FastTrack but same Melbourne players we know).
PLUS I spoke with AussieBB.
a) Aussie supply all the necessary ATA codes needed to setup our own VOIP on say a spa112 on the side.
b) AussieBB on HFC supply a Netcomm nf18acv modem with their contracts
2. so one approach could be:
HFC ---> NTU ---> pfsense box (as router to the LAN)
---> One LAN device could be the NF18ACV for VOIP
3. I don't need a block of IP's. All that is in my cloud resources for business matters and remains outside all this.
4. I like STATIC IP at home for VPN/remote access etc etc rather than dyndns approach. It helps me lock down who can access all my remote sites/servers/clouds based on my static IP
A lot of discussion on the net about how to get your IP from AussieBB. They run IPoE on NBN HFC. Even with static IP, we still get the modem site to seek a DHCP (client-dhcp) to fetch the IP from AussieBB.
Most likely they just supply a common static IP, down the dhcp request.
A lot of people have issues getting that bit right because they thing they need to set their routers to static Ip or they incorrectly stay on PPoE, whereas the solution i DHCP on IPoE.
5. So that's where we're at.
Gaz
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