One way Audio Voice VLAN

[mohammedalrawiib]

Hello everybody,

we are facing a very strange issue with our IP Phones some of them not all of them GXP2140_ I will explain everything first we created a voice VLAN after testing everything is working fine we have everything locally in our site so after few days IP Phones with Forti switch connection same voice VLAN had an issue where anybody connected to FortiSwitch couldn’t hear each other keep in my mind this happen after 1 minute the phone works well then this issue happens after troubleshooting we found that disabling edge port on the interfaces that are connected to an IP Phone will solve this issue , then we faced one way audio issue not all IP Phones some of them where A calls B A can hear B but B can’t hear A this is when they are both in the voice VLAN but if A is on the native VLAN 50 not the Voice VLAN 57 everything works well I have set the policy to allow everything in the firewall but the issue keeps coming anybody can help me out here please as this has been happening for one week and we still can’t find a solution this is happening on our site nothing outside everything is locally
would really appreciate the support.

[Mark Elsen]

  - Perhaps you can also post the question in  : https://forums.grandstream.com/c/ip-voice-telephony

   M.

[balaji.bandi]

Oneway voice can be many reasons, nothing related to switch (may be)

I am big fan of SIP and used many opensources - i suggest to check below link and understand one way voice :

https://blog.opensips.org/2023/07/06/troubleshooting-one-way-audio-calls/

[Flavio Miranda]

@mohammedalrawiib 

 One way audio is, most of time, related to NAT or firewall rule. Basically, the RTP traffic is flowing in one direction and not the other. I dont believe this is related to the vlan it seilf although I dont know this FortiSwitch  well enough. 

 Do you have any support from FortiNet? What did they say?

[mohammedalrawiib]

dear,

I don't really see where its being related to not since everything is locally also as for the firewall we have given it all service but still the same also note when we configure the interface back to vlan 50 which is the native vlan we don't face this issue 

regards

[Flavio Miranda]

Well, bear with me, we are talking about Fortnet device and goldstream device here. This is supposed to be a Cisco forum. But, I am not saying those device does not work properly, just saying I have no experience with them. For now, you did not provide any configuration and we are basically guessing here.

 If the device works properly in a native vlan and not in other vlan, it could be issue with tagging. Native vlan does not tag traffic. This could be one direction to follow.

 And the firewall does not allow all kind of traffic just simple because you allow it using rules. There are more on the back ground that can cause the firewall to not allow the traffic.

[mohammedalrawiib]

Many thanks for your support Flavio

I have already posted on many platforms including Forti and Grand stream forums am trying to minimize the problem really that's why I posted here just to check if am missing something.

also will look into the stuff you provided again.