Yes. The frames need to be copied from one port to the other. However, FS can still snoop on the media like detecting DTMF like an incoming caller responding to an auto-attendant/IVR.  Will using "bypass_media" parameter on the dialplan, the frames will just go from one endpoint (TDM channel) to the other endpoint (TDM channel on the other port) in like manner?  Or there are TDM parameters I need to know?

This is easy to visualize in SIP because packets just pass through the switches/routers - not through FS. 

Appreciate for more additional info.

/Nandy





On Sat, Sep 9, 2017 at 10:03 PM, Ken Rice <krice@freeswitch.org> wrote:
bypass and proxy media is only useful for rtp based calls (read sip to sip) you still have yo copy frames from on t1/e1 port to the other port.



Sent from my iPhone

> On Sep 9, 2017, at 08:35, Nandy Dagondon <nandy1925@gmail.com> wrote:
>
> Hello folks,
>
> I have a setup wherein I inserted FS in-between a PSTN exchange and a PABX linked via E1 R2.  My TDM card has dual E1 ports - port A is connected to the exchange and port B to the PABX.  If there's a call that pass-through FS (EXCH > PABX and vice-versa), I want incoming media from one port to immediately sent to the other port.  What mode should I set in the dialplan?  proxy_media or bypass_media?  I have read the Wiki on proxy_media. It's very clear to me re handling of TDM media.
>
> Thanks in advance for the inputs.
>
> /Nandy
>
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