Call quality and delays with Fanvil phones (STUN)

[Alphabetic]

Hi Guys,

i've just deployed 6 Fanvil X4 phones to a customer using STUN.

Customer reports the following:

1. External calls – line quality seems to deteriorate after a couple of mins on calls & becomes crackly
2. Frequent delays in hearing conversation exchange & also an echo sound
3. Internal calls – delay in conversation exchange seems more exaggerated than external calls

Since this report i've given each phone a static IP and i've forwarded their SIP and RTP ports (all different).

SIP ALG on th Zyxel is off and i've updated the firmware.

I've turned on PBX delivers audio for each EXT.

their internet speeds are over 100Mbps down and up.

The SIP provider is Voiceflex.

This is my first deployment with Fanvil - Has anyone had this experience or have any advice?

thanks,

 

[Saqqara]

Check out, as you have more than one phone at the remote site - https://www.3cx.com/community/threa...etgear-nighthawk-x4s-d7800.54620/#post-225296

You may be better off, setting up a SBC server

 

[Alphabetic]

You may be right. However, customer is due to get an onpremise server so PBX will be moving inhouse. hopefully this isnt in the too distant future.

Customer has tested since I made firewall changes (Did the same from your link).

they've advised the delay has gone so fingers crossed it was just a firewall issue.