configure T.38 fax relay on CME router using FXS card

[Abdulkader Naji]

I have FXS card and I need to use it to send fax and receive faxes over my voice CME ISR4331 router which have SIP trunk configured already.

 I read about the T.38 Fax relay configuration and I believe the solution will be to configure T.38 globally and create inbound dial-peer pointing to port on FXS port and outbound dial-peer to use one of SIP DOD range.

is the scenario is correct on my case ... any one suggest better solutions.

  I attached document of fax relay

[gmgarrian]

Hello,

You pretty much have the right idea. Make sure your ITSP supports t38 and see if there are any restrictions or conditions for it to work properly.  

[R0g22]

You are right. There is no dependability for the FXS card and fax protocol. The fax protocol is only relevant b/w the router and the ITSP SIP trunk.

[Abdulkader Naji]

I have Cisco Router ISR 4331 and I wan to configure Voice Card 2 Analog port with it?
do you think it supports.
or should I use ATA and configure it with CME ISR router.

the router Model ISR4331-V/K9 and FXS card part number is VIC3-2FXS/DID

[R0g22 · Accepted solution]

ISR-4k only supports NIM cards. VICS/WVICS are not supported. There is no forward compatibility for these cards with the new generation ISR's.
You either purchase a NIM-FXS or you go with an ATA.