Internal Calls to Remote offices with No Sound

[jpenberthy]

I have a client with 2 remote workers and calls to or from them to the main office result in no sound. Though they can answer calls from the call queues. They also can make and receive external calls. What is also weird is that the main office, and the other 2 locations are not local to the PBX. The PBX sits in the cloud and all internal calls with phones at the main office work just fine.

I have already tried the SBC at these remote locations and it doesn't fix the issue or creates a new one. Any ideas, as I cannot setup a VPN at each one. They are using Granstream Android phones.

 

[leejor]

It may be a remote router setting. What make/model is used there? Another forum member may have had a similar experience with the same model. I assume each of the sets has been given a unique local port. In some cases, routers may not be able to keep track of the voice ports that should be going to each set, if there are more than a couple, at one site. Use of an SBC would normally fix this. Since it doesn't, there may be something else going on here (router?)

Have you tried setting the extension options as PBX delivers Audio?