My client’s Freepbx server was set up in their office with 4 Yealink phones about 2 years ago. Recently, they had to move, and the new location is not yet suitable for the server and phones. Their secretary is working from her home but doesn’t want her Yealink phone setup there. Currently all calls bypass the PBX completely, and forward to her cell. This isn’t working for her sanity, calls come in at all hours.
I have set up the PBX server in my house. I can get Zoiper to work with my Freepbx from my iphone. Its not perfect. The lag is horrible when I’m outside of my LAN. Ive heard smart phone apps are not great, but maybe I’m not using the correct app or if I am, its not configured correctly? Any tips, or has anything been written specifically about this? The STUN server is enabled. Is that supposed to be? Like I said, it works, just not great.
It sounds to me that this is question of changing SIMs to use a different network operator with less buffer bloat in their network. I doubt there is any incentive to provide low latency for the type of packet needed for VoIP, giving that they are providing a service optimised for voice, as the basic mobile phone service. There may be a market advantage in providing low latency for rather shorter UDP packets, to support interactive gamers, I suppose.
I use Groundwire, selected for its reliability and using no battery when idle.
I called FreePBX echo test (in Vultr cloud ~18 ms from here).
Over Wi-Fi, ~330 ms mouth-to-ear latency:
