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This is the support site for Andrews & Arnold Ltd, a UK Internet provider. Information on these pages is generally for our customers but may be useful to others, enjoy!

VoIP NAT: Difference between revisions

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<indicator name="VoIP">[[File:menu-voip.svg|link=:Category:VoIP|30px|Back up to the VoIP and SMS Category Page]]</indicator>
You have probably been directed to this page because you are having trouble with Voice over IP services (using SIP) when using a router or firewall which does some sort of Network Address Translation (NAT). This page tries to explain some of the issues, and why it is often a problem.
You have probably been directed to this page because you are having trouble with Voice over IP services (using SIP) when using a router or firewall which does some sort of Network Address Translation (NAT). This page tries to explain some of the issues, and why it is often a problem.


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*SIP and NAT requires the call server, NAT device and phone to all play nicely and can still mean problems. There are a few specific cases we have tested and found reliable, but we cannot guarantee it will work in all cases or without some specific configuration settings
*SIP and NAT requires the call server, NAT device and phone to all play nicely and can still mean problems. There are a few specific cases we have tested and found reliable, but we cannot guarantee it will work in all cases or without some specific configuration settings


==Tips and recommendations for VoIP through NAT==
==NAT Tips==
If you do want to use NAT, then here are some tips if you are struggling:
If you do want to use NAT, then here are some tips if you are struggling to get calls working:


*'''Have your broadband with us.''' - we provide public IPs on all our connections.
*'''Disable UPnP''' on routers
*'''Disable UPnP''' on routers
*'''Disable SIP ALG''' on the router (or try enabling) See [[Disable SIP ALG]] - ALG can do funky things!
*'''Disable SIP ALG''' on the router (or try enabling) See [[Disable SIP ALG]] - ALG can do funky things!
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*'''Enable Stun''' settings on the VoIP phone, or disable stun it - stun.aa.net.uk can be used as the server name
*'''Enable Stun''' settings on the VoIP phone, or disable stun it - stun.aa.net.uk can be used as the server name
*Enter firewall rules on the router to allow UDP traffic from our VoIP servers to your VoIP phone. See [[VoIP Firewall]] - usually not needed for NAT, but needed if you have public IPs
*Enter firewall rules on the router to allow UDP traffic from our VoIP servers to your VoIP phone. See [[VoIP Firewall]] - usually not needed for NAT, but needed if you have public IPs
* '''Avoid ISPs that do CGNAT''' - that is NAT within their own network. - Having multiple levels of NAT between your handset and our service can cause problems in practice. Ask your ISP to provided you with a public IP address and no CGNAT.
* '''Switch to using IPv6'''


If you have two similar VoIP phones behind a router using NAT, you may have to change the port settings on one phone.
If you have two similar VoIP phones behind a router using NAT, you may have to change the port settings on one phone.
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[[Category:VoIP Faults]]
[[Category:VoIP Faults]]
[[Category:VoIP]]
Retrieved from "http://support.aa.net.uk/VoIP_NAT"