Playback a sound file somehow into the bridged call's both side at same time?

Question

I would like to create a greeting sound playback service for the PBX agents. The scenario is simple. When A calls B agent and B agent pick up the phone the system should play an audio file into the bridged call's both side at same time (for example: "Greeting! My name is Bob. How can I help you?"). The focus is on the "same time", but of course a few milliseconds difference acceptable. I have been thinking about it for hours without any breakthrough. I tried the ChanSpy with B option but it does not work as I want.

Any suggestions? :)

Thanks!

Answer 1

Two chanspy work ok for this type of task. One play to A, other to B

Also work ok transfer both to conference.

And playback to both via features.conf also work okay.