Understanding RTP Sound Issues

@tempes3k wrote:

Hi Guys,

I am using Freepbx, most oft the time it is working nice and smooth.
Sometimes i receive a call and after a few seconds we have only 1-way Audio. i can't hear the external caller anymore.
Sometimes it happens after a few seconds. Sometimes after 2mins ...
Most of the time it is working without issues.

i found this https://www.google.de/search?q=one+way+audio+fix+freepbx&oq=one+way+audio+fix+freepbx&aqs=chrome..69i57.4980j0j7&sourceid=chrome&ie=UTF-8

we are using as Router FritzBox 7580.
I have forwared port 5060 -> to my PBX.

Is it needed to forward also the RTP Ports to my pbx ?

I have a DECT Station and SNOM Phones.
The Phone and DectStation also are having setup for RTP Port Ranges.
Do i have to use the same ranges in my snom like in my PBX or is it better to use difrrent ranges?
Is the Portforward only needed to my PBX or also to my SNOM Phone / Dect station ?

Hope someone can make this clear.

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