Broadband Related > Voice over IP (VoIP)
Firebrick VoIP
Weaver:
If you have a Firebrick router, for example, why does one (possibly) need to use your Firebrick as a VoIP gateway ? Or is this not necessary? I wonder if this function is needed by those people who suffer from NAT, is that correct ? And since I don’t use NAT at all, I just have a hole in my firewall open towards my ISP, AA’s VoIP server and let traffic from there come in straight to my Siemens N300IP VoIP box. Is that a valid approach?
DaveC:
Yes, I think the main reason is to avoid NAT - if you can give your N300IP a public IP, then no need to use the Firebrick.
It does also offer some basic PBX features, mainly designed around a amall office scenario.
Weaver:
I was having some difficulty get it going, but this means that at least my basic approach is not insane. The N300 has a globally routable IPv4 address. I’ll ask AA to help me get it sorted out.
burakkucat:
--- Quote from: Weaver on October 24, 2021, 06:57:44 PM ---. . . since I don’t use NAT at all, I just have a hole in my firewall open towards my ISP, AA’s VoIP server and let traffic from there come in straight to my Siemens N300IP VoIP box. Is that a valid approach?
--- End quote ---
Yes, that appears to be a viable method. Just make sure that the N300IP is using the latest released firmware image.
DaveC:
--- Quote from: Weaver on October 24, 2021, 07:52:12 PM ---I was having some difficulty get it going, but this means that at least my basic approach is not insane. The N300 has a globally routable IPv4 address. I’ll ask AA to help me get it sorted out.
--- End quote ---
It's quite well documented on their wiki. Firstly, the N300 config:
https://support.aa.net.uk/VoIP_Phones_-_Gigaset_N300
and the required Firebrick rules to pass SIP traffic through to your N300's IP:
--- Code: ---<rule name="SIP" source-ip="81.187.30.110-119 90.155.3.0/24 90.155.103.0/24" target-ip="1.2.3.4" target-port="5060" action="accept"/>
<rule name="RTP" source-ip="81.187.30.110-119 90.155.3.0/24 90.155.103.0/24" target-ip="1.2.3.4" target-port="1024-65535" protocol="17" action="accept"/>
--- End code ---
(the above is taken from https://support.aa.net.uk/VoIP_Firewall#Example_FireBrick_Config - I've removed the ipv6 addresses as the N300 doesn't support it).
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