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VoIP NAT: Difference between revisions
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→Tips for VoIP through NAT
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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
==Tips and recommendations for VoIP through NAT==
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 SIP ALG''' on the router (or try enabling) See [[Disable SIP ALG]] - ALG can do funky things!
*'''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
* '''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.
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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