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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

VoIP NAT (view source)

Revision as of 09:39, 11 February 2023

288 bytes added ,  11 February 2023
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→‎NAT Tips
If you do want to use NAT, then here are some tips if you are struggling:
 
*'''Disable UPnP''' on routers
*'''Disable SIP ALG''' on the router (or try enabling) See [[Disable SIP ALG]] - ALG can do funky things!
*Reduce the '''registration 'expiry'''' - try '''10 minutes''' (600 seconds) the default on devices us usually an hour. - helps keeps the registration active
*Set '''SIP Keepalive''' (if the phone has this option) to '''30 seconds''' - this helps keep the NAT session live on the router
*If the VoIP phone has a config setting to enter your external/public IP address, then enter the address of your router's WAN port
*Disable'''Enable Stun''' settings on the VoIP phone, or trydisable enablingstun 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
 
If you have 2two similar VoIP phones behind a router using NAT, you willmay have to change the port settings on one phone.
The local SIP port (often 5060) and the local RTP port(s) can't be the same on the 2 phones - if they are the same, you'll
get weirdness on incoming calls.
AA-Andrew
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