I am based in Cebu, Philippines, I need a VoIP phone adapter to minimize by phone billing. I need to buy VoIP phone adapter but I don't know how to configure. I need an international call especially Japan. Please tell so that I can buy now the Linksys PAP2T model.

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I use the Linksys PAP2T-NA, and they work well for me.
However, I may suggest using the SPA-2102-NA because it includes a NAT-Router too. It may be easier to configure for QOS (quality of service for VoIP) and may automatically take care of VoIP port forwarding issues.
With PAP2T-NA, you will need to know how to "Port Forward" or "Port Trigger" SIP ports 5060-5063 and RTP ports 16384-16482 on your NAT-Router. This is important for VoIP to work properly.
You can configure two separate VoIP services with PAP2T-NA.
I configure mine for CallCentric on line-1 and InPhonex on line-2.
Just follow the configuration instructions of your PAP2T-NA or SPA-2102-NA adapters as documented by Linksys.
Also, your VoIP service providers like CallCentric and Inphonex will provide information on how to configure your login and password into your VoIP ATA adapters.
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