No voice during incoming outgoing calls

Hi, if anyone faced this issue before....there is no voice heard during incoming outgoing calls. However, we are able to talk on Skype or listen to music.

To me this sounds like the RTP stream problem - it probably does not pass the firewall / nat on the way between SIP provider and you.
What may have happenned is, that either on your Belkin router/NAT, or on internet ISP's router/NAT the SIP ALG (Application Layer Gateway) was enabled.
If this is the case, you need to disable SIP ALG on your router and/or ask your internet ISP to disable it on the firewall router.
Another issue may have been if you have (accidentaly) changed the port forwarding on your Belkin router, and/or the PAP2T local LAN IP address changed and the port forwarding no longer works.
So my proposals to check would be :
- check and DISABLE SIP ALG on your Belkin (if router has this feature)
- check the port forwarding on your Belkin router ... IF you setup port forwarding for 5060/61 you MUST set the same for RTP ports (16384-16483)
- if you don't have port forwarding on your Belkin, try to setup forward of 5060-5061 AND 16384-16483*.
*(If this is too many ports, set the the RTP portrange on PAP2T to 16384-16394 for example and then forward only that range)
- if neither of above helps, change your Line1 SIP port from 5060 to let's say 6070, and RTP ports to the range let's say 17300 - 17310
- last you may do on your side is to remove all port forwarding and put the PAP2T to the DMZ settings of your Belkin router.

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The following article will provide some troubleshooting steps for this issue:
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http://support.apple.com/kb/TS1630
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