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84 posts

Master Geek


Topic # 105003 25-Jun-2012 10:18 Send private message

With the question of security etc in mind - are Private SIP trunks possible, or even feasible?
What I mean by that, is say you have a direct data circuit to a SIP provider, with no internet access on the circuit, like a closed VPN. Then connect to the SIP proxy internal address across the data circuit, to provide outside connectivity to your ip-pbx?

Or is this a fundemental voilation of SIP's protocol, being peer to peer?
This eliminates the possibility to use stun, and I am not sure that having the ippbx not accessible at all from the internet would cause problems or not.
It would certainly help with hacking though, given that the 5060 ports are not accessible...
Any suggestions/recommendations?

Cheers,
Z

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  Reply # 645730 25-Jun-2012 10:22 Send private message

SIP isn't a peer to peer protocol.

Many providers will only deliver VoIP connections over dedicated data connections (HSNS for example) and it's certainly very common in the industry.


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  Reply # 645763 25-Jun-2012 10:55 Send private message

Yep - Gen-I and TelstraClear offer private network SIP products now, and I'm sure the public operators offer private connections too.

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Master Geek


  Reply # 645799 25-Jun-2012 11:54 Send private message

Many thanks guys - appreciate the feedback.
Sounds like this is the way to go then.

cheers,

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  Reply # 645833 25-Jun-2012 12:44 Send private message

While security etc. is really important I do agree, unless QoS is an issue over the public internet I see no reason for a private connection. At the end of the day the security risk is at the carrier's gateway, not your system. This is because you can fully firewall your system so that the only ingress and egress traffic go to the carrier's gateway IP.

The problem with private circuits is that you will lose the redundancy you get with the internet e.g. if my fibre connection gets cut, I can drop in a 3g connection basically straight away.





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  Reply # 645845 25-Jun-2012 13:02 Send private message

zimbonz: Many thanks guys - appreciate the feedback.
Sounds like this is the way to go then.

cheers,


Whether or not it's the "way to go" dosn't have a simple answer. There are pros and cons, and at the end of the day depends entirely on how you want to configure things. Security risks of exposing a PBX to the internet can be essentially eliminated by configuring things correctly.


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  Reply # 646123 25-Jun-2012 22:35 Send private message

i have a private SIP trunk with callplus. its delivered on a seperate VLAN over the fibre and has a private ip range. it certainly makes firewalling easier, but it also segregates your VoIP traffic from your internet traffic and means you dont have to stuff around with QoS.




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