disabled "PBX Delivers Audio" = direct media?

[dandenson]

does disabling "PBX Delivers Audio" mean direct media ( in asterisk terms... ) and is this specifically for on-prem PBX? I'm not familiar enough with 3CX under the hood to know how it would setup the call for direct media.

in a nutshell, I'm asking if in a cloud-hosted scenario phones behind NAT (a decent implementation of NAT...) can get direct RTP via the contact address thus taking the PBX out of the loop.

I'm not so concerned with the bandwidth usage, but I do have a few clients that are right on the border of comfortable latency at about 250ms. When I ping the provider IPs from the site I'm getting much better ~120ms latency. They are on some back-woods internet co-op that does have reliable service, but just doesn't peer with the right people for a low latency path to digital ocean, aws, or google.

 

[leejor]

If you are hosted (sets not on the same LAN as the server), then you are best using an SBC (or VPN) at the remote site. The SBC does allow voice packets to go direct from set to set.

If you are using STUN, with only a few sets at the remote location, some routers are not able to properly keep track of voice packets. Sets are seen by 3CX as (publicIP : port). In this case, to avoid "no audio" issues, using PBX Delivers Audio is usually a solution. However, all calls will now travel to and from the PBX, not direct, set, to set, requiring more bandwidth.

PBX Delivers Audio (sets) is normally disabled, and only used when needed.

 

[eddv123]

There was a huge string on this subject raised recently, have a read through:
https://www.3cx.com/community/threads/what-does-pbx-delivers-audio-exactly-do.57439/#post-240417

 

[YiannisH_3CX]

Please have a look at the academy material regarding phones provisioned with STUN. For more details you can watch the video presentation linked above the presentation.
https://www.3cx.com/3cxacademy/videos/intermediate/configuring-remote-extensions/