Allworx 24X Manual de usuario descargar pdf (Pagina 17)

VoIP White Paper

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Revised: February 8, 2007

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8 Allworx Solves the SIP NAT Problem

Using VoIP protocols with NAT/Firewalls can be a big headache, unless you are using Allworx equipment.

Allworx products are designed to work together – automatically discovering networking topology between end-

points and adjusting all VoIP negotiations accordingly. Allworx products are able to do this even when third-

party firewalls are involved in the path, but this requires the use of Allworx IP phones or servers at the

associated end points. Non-Allworx end-points may not support all the necessary mechanisms to make this

possible.

Generally speaking, the primary requirement is for each Allworx server to have its WAN port connected directly

to the Internet at a publicly routable IP address. The Allworx server does NOT have to be the primary data

NAT/Firewall for the LAN; it must have a publicly routable WAN connection in parallel with an existing firewall.

Note: First introduced with Allworx server software Release 5.2, many times it is now also possible to place

the Allworx server behind a 3

party NAT/Firewall. New advanced features were added in Release 5.2

to allow remote VoIP connectivity with a properly configured 3

party firewall. See the admin manual for

details.

Remote end-points (such as Allworx IP phones) on a LAN can typically be behind any single NAT/Firewall,

whether it is an Allworx server acting as the firewall or any third-party NAT/Firewall product. InSciTek

specifically tests Cisco/Linksys™ and Sonicwall™ products as base verification reference points of “typical”

firewalls. Since InSciTek doesn’t control the implementation of third-party products, it can’t guarantee proper

operation, but would expect proper operation with most firewalls, including the ones InSciTek tested.

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Allworx 24X Manual de usuario Pagina 17