Configuring NAT for VoIP Phones

If VoIP is being used, the default settings may not be correct in certain circumstances. The default settings handle  the majority of scenarios, but depending on the specifics of a particular setup, changes may be necessary to obtain a working configuration.

The following sections will help to get local handsets working with a remote PBX. If the PBX is local and trying to communicate with a remote SIP trunk, see Configuring NAT for a VoIP PBX for more ideas.