# Problem probably with NAT

**URL:** <https://community.asterisk.org/t/problem-probably-with-nat/3028>\
**Category:** Asterisk Support\
**Created:** [December 9, 2005, 4:54pm UTC](https://community.asterisk.org/t/problem-probably-with-nat/3028 "2005-12-09T16:54:49Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![martin11\_ar](https://avatars.discourse-cdn.com/v4/letter/m/ee7513/32.png) [@martin11\_ar](https://community.asterisk.org/u/martin11_ar)\
**Post date:** [December 9, 2005, 4:54pm UTC](https://community.asterisk.org/t/problem-probably-with-nat/3028/1 "2005-12-09T16:54:49Z")

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Hello. I could configure asterisk and redirect my internet server to call from a FWD soft phone to a PSTN phone (X100P) and from a PSTN phone to a FWD soft phone correctly.

1. FWD1(remote PC) ---------\> FWD2 (Asterisk) --------\> ZAP

2. ZAP -----------\>Asterisk ------------\> FWD1(remote PC)

But suddenly asterisk didn’t leave me speak in any way.  
I’m using Pulver Communicator and i can call, asterisk answer the call but strangely if i call logged out i can hear the “demo-congrats” message but  
if i call logged in i can’t hear the “demo-congrats” message and i can’t dial numbers to establish the communication that i want in any way.  
I don’t know what the problem was because i didn’t change the configurator files after i could call and speak.  
i need some help.Thanks.

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**Author:** ![IronHelix](https://avatars.discourse-cdn.com/v4/letter/i/da6949/32.png) [@IronHelix](https://community.asterisk.org/u/IronHelix)\
**Post date:** [December 9, 2005, 7:37pm UTC](https://community.asterisk.org/t/problem-probably-with-nat/3028/2 "2005-12-09T19:37:14Z")

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first, in sip.conf set localnet= externip= and set nat=yes. Then in your router, forward UDP ports 5060 and 10000-20000 to your \* box. Does that do anything?

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**Author:** ![martin11\_ar](https://avatars.discourse-cdn.com/v4/letter/m/ee7513/32.png) [@martin11\_ar](https://community.asterisk.org/u/martin11_ar)\
**Post date:** [December 9, 2005, 7:43pm UTC](https://community.asterisk.org/t/problem-probably-with-nat/3028/3 "2005-12-09T19:43:04Z")

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I did it and it ran but now it doesn’t. I’m sure i didn’t change any file after it ran…